deps: qualify lower-allocation typed span projection in the root stack

.github/workflows/stock-span-codec.yml

@@ -63,6 +63,12 @@ jobs:
             '{:paths ["src" "test"] :deps {io.github.chucklehead-dev/jolt-codec {:git/url "https://github.com/chucklehead-dev/jolt-otel-clickhouse.git" :git/sha "98e93e2a6726c435d9b55ada9a088c2dbf5b1c99" :deps/root "incubator/codec"}}}' \
             -m oscope.json-reader-legacy-probe
           "$JOLT_BIN" -Srepro -M:test-export-options
+          "$JOLT_BIN" -Srepro -Sdeps '{:paths ["src" "test"]}' -e \
+            "(require 'clojure.test)
+             (binding [*assert* false]
+               (require 'oscope.field-slot-native-probe-test)
+               (let [r (clojure.test/run-tests 'oscope.field-slot-native-probe-test)]
+                 (System/exit (if (zero? (+ (:fail r) (:error r))) 0 1))))"
           "$JOLT_BIN" -Srepro -A:stock-span-codec -Sdeps '{:paths ["src" "test"]}' \
             -m oscope.stock-codec-runner-test
           "$JOLT_BIN" -Srepro -Sdeps '{:paths ["src" "test"]}' \
@@ -74,11 +80,16 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          for task_consumer in embedded standalone embedded-typed; do
+          for task_consumer in embedded standalone; do
             timeout --signal=TERM --kill-after=5s 120s "$JOLT_BIN" \
               -Srepro -A:test-durable:stock-span-codec \
               -m oscope.export-options-native-test-runner stock-codec "$task_consumer"
           done
+          # Reuse the typed live-query fixture, adding a numeric witness
+          # for actual field-slot results AFTER startup, not construction alone.
+          timeout --signal=TERM --kill-after=5s 120s "$JOLT_BIN" \
+            -Srepro -A:test-durable:stock-span-codec \
+            -m oscope.field-slot-native-probe
           timeout --signal=TERM --kill-after=5s 120s "$JOLT_BIN" \
             -Srepro -A:test-durable:stock-json-reader \
             -m oscope.export-options-native-test-runner stock-reader standalone

CHANGELOG.md

@@ -2,6 +2,14 @@
 
 ## Unreleased
 
+- Update the root exporter to avoid temporary maps and vectors when projecting
+  small typed span manifests on the selected native path. Preserve complete
+  captured attributes, value/status rules, fallback and Durable confirmation.
+  Keep encoding defaults, SDK/driver/JSON pins and the separate minimal embedded
+  profile unchanged. Qualify real post-startup typed projection separately from
+  existing file-backed capture/fresh-reader checks; this is not a combined
+  typed-recovery proof, application throughput or slow-tail guarantee.
+
 - Update the root OTel SDK pin to reuse its scalar normalization fast path
   and avoid lazy fixed-field classification during OTLP ingestion, reducing
   temporary allocation while preserving value limits and error handling.

deps.edn

@@ -22,7 +22,7 @@
          :git/sha "649c993780a0f269938c9c6afa3bae7e9709bb48"}
         io.github.chucklehead-dev/jolt-otel-clickhouse
         {:git/url "https://github.com/chucklehead-dev/jolt-otel-clickhouse.git"
-         :git/sha "1e7cc8d0a821e589ec087774d118effcaab1d234"}
+         :git/sha "a6cbf9390d1521026e5da5d2ea3cfc0b8916ae2b"}
         io.github.chucklehead-dev/jolt-otel-viewer
         {:git/url "https://github.com/chucklehead-dev/jolt-otel-viewer.git"
          :git/sha "5723a7c28c3bb3ae7cb27f9856b90463e77df523"}

docs/stock-codec.md

@@ -13,6 +13,14 @@ The selected component supports the SDK's ordinary record link contexts without
 map copies. Older components without that capability reject during startup;
 custom record `seq` implementations remain unsupported.
 
+The root exporter can now collect small approved typed span projections directly
+into field slots, avoiding temporary location maps and vectors. Eligible plans
+have up to eight distinct fields across the three trace attribute locations;
+unsupported shapes, aliases or changed policies keep the existing fallback.
+Complete generic attributes and typed value/status rules are preserved. There
+is no new configuration switch or default encoder change, and component savings
+do not establish application throughput or slower-batch latency improvements.
+
 Activate the root `:stock-span-codec` alias when starting Oscope. A library
 consumer must instead declare the independent component in its own deps.edn;
 dependency aliases do not propagate:
@@ -78,3 +86,11 @@ forbids the legacy native JSON writer, and checks independent recovery after
 SDK or socket capture. It does not establish S3, Langfuse, application standalone
 packaging, sustained throughput or population-tail performance. No throughput
 target is claimed by enabling these options.
+
+The embedded typed fixture additionally requires a positive field-slot result
+after application startup, before its existing terminal receipt. Constructor
+calls, startup-only activity and false/nil declines cannot satisfy that witness.
+This fixture checks a live typed query against an in-memory object backend;
+the separate file-backed embedded/standalone cases check independent recovery.
+Those are different gates, not one combined typed-recovery proof. Its counters
+are test instrumentation, not a performance measurement or delivery receipt.

research/exporter-field-slot-pin-20261021/README.md

@@ -0,0 +1,114 @@
+# Root exporter field-slot integration
+
+Base Oscope `2615d30e28ff9c2a58197187c72622e5a551f6d1`; update ONLY the root
+exporter from `1e7cc8d0a821e589ec087774d118effcaab1d234` to merged exporter
+PR157 `a6cbf9390d1521026e5da5d2ea3cfc0b8916ae2b`. Preserve the direct SDK
+`3366a332`, driver `3314b79`, ordinary JSON `0f51b991`, codec aliases `7ab2bed`,
+crypto/provider pins, runtime floor, storage/encoding/configuration defaults.
+No application implementation, persisted format or lifecycle/model change.
+
+The separately pinned `profiles/embedded` remains unchanged. Root
+`oscope.embedded/start!` and that minimal dependency profile are NOT the same
+dependency authority. Minimal-profile refresh stays in #167; stacked PR144 is
+not implicitly merged or approved by this root update.
+
+## Local checks executed
+
+Official stock Jolt0.8.23, SHA256
+`7bf7acae4b4bcb5c27b3651fa4a94d2d4e6a7fc43b5b821def2f8be3d6f00e94`,
+mandatory Chez10.4.1 wrapper. Child `JOLT_BIN` and PATH explicitly select that
+same executable, not installed plain Jolt0.8.10. No compiler rebuild or timing
+benchmark. Native stock-codec cases explicitly use cached libchdb26.9.0.
+Headless cases use each graph's declared native package, including the old
+minimal profile's26.7.3 package.
+
+| Gate | Result |
+| --- | --- |
+| Current-main headless baseline |361tests /3539assertions pass|
+| Candidate headless |363 /3560 pass|
+| New witness controls |1 /18 pass|
+| Witness controls with assertions disabled |1 /18 pass|
+| Actual typed SDK capture/live query |1 /8 pass;1 post-startup field-slot result|
+| File-backed embedded SDK capture + fresh reader1 |1 /18 pass;reader terminal/settled/valid|
+| Standalone HTTP capture + fresh reader0 |1 /45 pass;reader terminal/settled/valid|
+| Native HTTP JSON reads + fresh reader0 |1 /45 pass;3 accepted /0 declined document reads|
+
+The extra headless assertions are18 witness controls and3 exact prior-exporter
+resolution controls. Existing resolution tests confirm root SDK3366a332 still
+wins over exporter transitive SDK, with the expected HTTP/provider selections.
+The root graph is not silently upgraded to exporter-own SDK6cd57c86.
+
+Real red/green:before changing deps.edn, the new native probe with the actual
+prior exporter rejected with the fixed unavailable-field-slots error, before
+application storage acquisition. After the pin update, the same probe observes
+one real selected result during capture and the existing typed live query passes.
+Startup/constructor-only calls, missing projectors and false/nil declines are
+rejected by pure controls. Positive output is numeric only; no spans, credentials
+or persisted data are logged by the observer. It is not a timing instrument.
+
+## Important coverage boundary
+
+Native fixture3 installs an approved Boolean manifest, performs actual SDK
+capture and checks typed value/status via the live source. It uses an in-memory
+object backend. It DOES NOT independently recover that typed capture.
+Fixtures4/2 separately use file-backed stores and independently joined fresh
+reader processes; they verify other multi-signal content. Do not combine these
+successes into a claim of typed physical-field recovery. That existing
+application-level composition gap is tracked in
+[#177](https://github.com/chucklehead-dev/oscope/issues/177).
+The exporter library's older-stack full physical-row recovery evidence remains
+separate from this consumer integration.
+
+No new throughput/p50/p90/p95/p99/S3/Langfuse/Samizdat/packaging or zero-allocation
+claim. Defaults are not switched to the experimental codec. No unchanged
+exhaustive or model-checker run; there is no new protocol action or ACK meaning.
+
+## Failed launch/configuration attempts retained
+
+- First baseline command exited127 before Jolt:an unquoted inherited Windows
+  PATH with spaces split the env assignment. Quoted PATH fixes the launcher.
+- First actual baseline forced26.9 globally, causing the OLD minimal profile's
+  timestamp gate to reject (361tests,3537passes,2failures). This was the wrong
+  native/runtime pairing, not an exporter regression. Removing JOLT_CHDB_LIB
+  lets that graph select its declared26.7.3 package; full baseline then passes.
+- First assertions-disabled invocation tried to analyze clojure.test/run-tests
+  before loading that namespace inside the binding form. It stopped before
+  tests. A separate require of clojure.test before the binding fixes selection.
+
+All corresponding logs are retained, not presented as passing tests. The typed
+probe's initial docstring called it a capture/recovery fixture; source inspection
+corrected that label to live-query only (no executable observer change). This
+note and issue177 explicitly preserve the distinction. Final-head hosted checks
+must execute the current source before merge; local successes do not stand in
+for those checks.
+
+## Reproduce / retention
+
+From root, prefix the pinned stock CLI with
+`/home/chuck/ai-src/tools/jolt-with-chez-10.4.1`:
+
+```text
+jolt -Srepro -M:test-headless
+jolt -Srepro -A:test-durable:stock-span-codec -m oscope.field-slot-native-probe
+jolt -Srepro -A:test-durable:stock-span-codec -m oscope.export-options-native-test-runner stock-codec embedded
+jolt -Srepro -A:test-durable:stock-span-codec -m oscope.export-options-native-test-runner stock-codec standalone
+jolt -Srepro -A:test-durable:stock-json-reader -m oscope.export-options-native-test-runner stock-reader standalone
+```
+
+Set JOLT_BIN/PATH for children as above; use26.9 only for the current-root native
+cases, not globally across the old minimal profile. Existing fixture controllers
+join their readers and retire successful stores through their established gates.
+No build/binary/new native asset was created. Small original logs at
+`/home/chuck/ai-src/evidence/oscope-exporter-pin-20261021.ldxeRHQs`;
+copies below are for public synthetic qualification evidence. The selected
+pre-native source manifest predates the docstring-only correction and is not
+complete transitive compile-time attestation.
+
+## Independent review
+
+Claude's bounded source-only review found no blockers. It checked the observer's
+five rejected scenarios, transparent return/error handling, CI case retention,
+unchanged SDK/profile pins, red-control provenance and assertion-count arithmetic.
+The raw review is retained in `claude-review.txt`; Claude did not execute the
+tests. Codex inspected the actual diff and owns the local execution evidence.
+Final-head hosted CI remains required before merge.

research/exporter-field-slot-pin-20261021/candidate-native-source-sha256.txt

@@ -0,0 +1,5 @@
+9a251d7f224f2e13f6f991ee212264e12a4bed86a4feeb4bd9a386bdd00dc1dc  deps.edn
+d4a03658a27c176a28995876917af686421314e9b61e890554cf3dd522296c09  test/oscope/field_slot_native_probe.clj
+0e1e83a20c15e222175cd409e260ef91a4f55c3b95c9904f683bcd30c65d37e3  test/oscope/field_slot_native_probe_test.clj
+347c0a09d92de22b7a760050214d00e974f9b458e622803298bffcb7ec3d97e6  test/oscope/export_options_native_test_runner.clj
+b08cac64545a527ca55e17c5338650c42b608679c520c11b9b2c15e0b855262e  test/oscope/embedded_durable_integration_test.clj

research/exporter-field-slot-pin-20261021/claude-review.txt

@@ -0,0 +1,20 @@
+No ExitPlanMode or Write tool is available in this session, so I'll deliver the review directly here.
+
+## Review: root exporter field-slot pin (a6cbf939)
+
+**Blockers: none found.**
+
+### Verified claims
+
+- **Witness correctness** — traced all 6 `run-control` scenarios in `field_slot_native_probe_test.clj` against `field_slot_native_probe.clj`: `:missing-projector` (no projector fn), `:constructor-only` (fn built, never invoked), `:startup-only` (invoked only while `active?` is still false, before `embedded/start!` returns), and `:declined-false`/`:declined-nil` (invoked post-startup but with a falsy result) all fail the `(and @active? (pos? @selected))` gate and throw `::unobserved-field-slots`. Only `:selected` (genuinely post-startup, truthy result) passes and prints the counter. No construction/startup/false/nil path can satisfy the witness.
+- **Wrapper transparency** — the `factory-var` wrapper always returns `project`'s real return value to the span caller, and the `test/test-vars` wrapper always returns the real `result` after its check; neither swallows results or errors.
+- **Existing receipt checks unaffected** — the gate's check/print happens *after* `run-tests`/fixture execution, so the wrapped fixture's own terminal receipt assertions still run and still determine pass/fail independently.
+- **Red control confirmed in logs** — `prior-exporter-field-slot-probe.log` shows the prior exporter (`1e7cc8d0`) throwing `:oscope.field-slot-native-probe/unavailable-field-slots` from `ns-resolve` returning nil — a genuine missing-capability rejection, not a masked `require` failure.
+- **Assertion-count arithmetic checks out** — 18 witness-control assertions (12 from the two `is` groups in the single deftest + 6 from `fixture/-main`'s mock `is` firing once per `run-control` call) + 3 new assertions in `dependency_resolution_test.clj`'s `prior-field-slot-exporter-is-a-causal-red-control` = 21, matching the reported 3539→3560 assertion delta and 361→363 test delta exactly.
+- **CI coverage retained** — `stock-span-codec.yml` still runs embedded+standalone stock-codec, the new typed field-slot probe, and stock-reader standalone, plus the pre-existing json-reader/stock-codec/legacy-probe checks. No step removed.
+- **No inadvertent SDK/profile rollout** — `deps.edn` changes only the `jolt-otel-clickhouse` root pin to `a6cbf939`; SDK/driver/JSON/crypto pins and the `:stock-span-codec`/`:stock-json-reader` codec alias SHA are unchanged. `profiles/embedded` is untouched; the workflow uses no `:override-deps` affecting it.
+- **Scope honesty** — CHANGELOG, `docs/stock-codec.md`, and the research README all consistently disclose that fixture 3 is a memory-backed live query (not independent typed recovery), point to issue #177 for that gap, and disclaim throughput/perf/S3/Langfuse claims. Nothing is masked.
+
+### Non-blocking observations
+
+None — implementation, tests, CI, and docs are internally consistent and match each other's claims exactly.

research/exporter-field-slot-pin-20261021/logs/assertions-disabled-launch-1.log

@@ -0,0 +1,3 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+error[analyze/unknown-namespace]: No such namespace: clojure.test
+  --> 1:96

research/exporter-field-slot-pin-20261021/logs/baseline-headless.log

@@ -0,0 +1,17 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+
+FAIL in (minimal-fixture-runs-the-real-native-stalled-remote-stack) (embedded_profile_test.clj:432)
+Unhandled exception: Unqualified chDB telemetry timestamp wire
+  ex-data: {:type :otel.exporter.chdb/unqualified-timestamp-wire}
+  trace:
+    otel.exporter.chdb/exporter (~/.jolt/gitlibs/https___github.com_chucklehead-dev_jolt-otel-clickhouse.git/dfbc9ea64962b25c2f38912daa1c5a7b7339deaf/src/otel/exporter/chdb.clj:1204)
+
+expected: (zero? (:exit run-result))
+  actual: (not (zero? 1))
+
+FAIL in (minimal-fixture-runs-the-real-native-stalled-remote-stack) (embedded_profile_test.clj:434)
+expected: (str/includes? (:out run-result) "minimal embedded native fixture: PASS")
+  actual: false
+oscope HTTP overload load {:attempts 10000, :rejected 10000, :max-queue-depth 1, :rss-before-kib 631372, :rss-after-kib 631372}
+
+Ran 361 tests. 3537 assertions passed, 2 failures, 0 errors.

research/exporter-field-slot-pin-20261021/logs/baseline-launch-1.log

@@ -0,0 +1 @@
+env: ‘Files/Eclipse’: No such file or directory

research/exporter-field-slot-pin-20261021/logs/baseline-native-default-headless.log

@@ -0,0 +1,4 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+oscope HTTP overload load {:attempts 10000, :rejected 10000, :max-queue-depth 1, :rss-before-kib 655348, :rss-after-kib 655348}
+
+Ran 361 tests. 3539 assertions passed, 0 failures, 0 errors.

research/exporter-field-slot-pin-20261021/logs/candidate-embedded-fresh-reader.log

@@ -0,0 +1,7 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+:export-encoding-fixture stock-codec embedded
+:durable-native-executed fixture 4
+:durable-native-child reader 1 :exit 0 :terminal true :settled true :valid true
+:stream-native-calls 5
+:stock-codec-calls 5
+:durable-native-receipt fixture 4 1 18 0 0 1

research/exporter-field-slot-pin-20261021/logs/candidate-field-slot-native.log

@@ -0,0 +1,7 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+:export-encoding-fixture stock-codec embedded-typed
+:durable-native-executed fixture 3
+:bounded-field-slots-ingestion-calls 1
+:stream-native-calls 1
+:stock-codec-calls 1
+:durable-native-receipt fixture 3 1 8 0 0 1

research/exporter-field-slot-pin-20261021/logs/candidate-headless.log

@@ -0,0 +1,4 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+oscope HTTP overload load {:attempts 10000, :rejected 10000, :max-queue-depth 1, :rss-before-kib 637692, :rss-after-kib 637692}
+
+Ran 363 tests. 3560 assertions passed, 0 failures, 0 errors.

research/exporter-field-slot-pin-20261021/logs/candidate-standalone-fresh-reader.log

@@ -0,0 +1,7 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+:export-encoding-fixture stock-codec standalone
+:durable-native-executed fixture 2
+:durable-native-child reader 0 :exit 0 :terminal true :settled true :valid true
+:stream-native-calls 1
+:stock-codec-calls 1
+:durable-native-receipt fixture 2 1 45 0 0 1

research/exporter-field-slot-pin-20261021/logs/candidate-stock-reader-fresh-reader.log

@@ -0,0 +1,8 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+:export-encoding-fixture stock-reader standalone
+:durable-native-executed fixture 2
+:durable-native-child reader 0 :exit 0 :terminal true :settled true :valid true
+:stream-native-calls 1
+:stock-codec-calls 1
+:stock-reader-results {:accepted 3, :declined 0}
+:durable-native-receipt fixture 2 1 45 0 0 1

research/exporter-field-slot-pin-20261021/logs/field-slot-witness-controls-assertions-disabled.log

@@ -0,0 +1,3 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+
+Ran 1 tests. 18 assertions passed, 0 failures, 0 errors.

research/exporter-field-slot-pin-20261021/logs/field-slot-witness-controls.log

@@ -0,0 +1,3 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+
+Ran 1 tests. 18 assertions passed, 0 failures, 0 errors.

research/exporter-field-slot-pin-20261021/logs/prior-exporter-field-slot-probe.log

@@ -0,0 +1,6 @@
+[jolt.deps] deps declare :deps/prep-lib steps jolt does not run (their compiled/generated assets will be missing): yogthos/selmer
+Unhandled exception: Bounded field-slot exporter capability is unavailable
+  ex-data: {:type :oscope.field-slot-native-probe/unavailable-field-slots}
+  trace:
+    oscope.field-slot-native-probe/field-slot-factory-var (./test/oscope/field_slot_native_probe.clj:12)
+    oscope.field-slot-native-probe/-main (./test/oscope/field_slot_native_probe.clj:19)