docs(P-022): reconcile the status surfaces with live #261/#250 state (Checkpoint 0)

[PhysShell]

Что и зачем

Checkpoint 0 — a standalone, docs-only repair of drift that already exists on main. After #261 was closed completed, the reconciliation was issue-only, so the git-tracked status surfaces still describe #261 as about-to-close and #262 as blocked by it, while the live issues say #261 is closed. This makes the tree agree with the already-existing live primary state.

It contains no Stage-1 implementation and makes no Stage-1 claim. No code, no fixtures, no workflows, no generated fragments. Three files, status language only; historical rationale (the measurement narratives, the C-1..C-5 recap, the ruling prose) is deliberately untouched.

Ordering note — why the Windows tail may say "mirrored" here. An issue edit and a git commit are not atomic, so a docs commit writing "mirrored" while live #250 still lacked the mirror would re-create the exact drift this checkpoint removes. The concise referential Windows A/B/C mirror was therefore added to live #250 first and then re-read from GitHub to prove it present in primary state; only after that proof was this tree change prepared. The invalid-UTF-8 tail needed no such gate — #250 already carried it.

What changed, by anchor:

file	was	now
docs/proposals/P-022-rust-core-migration.md (row 7b)	the owner closes #261 by hand	#261 closed completed 2026-09-08 (PR #347, 206e9c7)
docs/proposals/P-022-rust-core-migration.md (row 7b, ×2)	the #250 roadmap mirror pending reconciliation	mirrored in #250's Still missing list
docs/proposals/P-022-rust-core-migration.md (row 8)	blocked by #261 — the production OwnIR executable alone	that prerequisite (C-5) is satisfied
docs/proposals/P-022-rust-core-migration.md (preferred queue)	the spent "bookkeeping step" note	the close itself, past tense
docs/proposals/README.md (P-022 index row)	the owner closes #261; step 8 (#262) is blocked by #261 alone + the two mirror tails	#261 closed completed; #262 next, prerequisite satisfied; both tails mirrored
rust/README.md (own-cli row)	#261 261.B — the owner closes the issue	#261 261.B landed; #261 closed completed

Note that row 8 keeps #263's baselines are the evidence prerequisite of the cutover decision unchanged — this PR removes a stale blocker, it does not claim #262 is unconditionally clear.

No merge authority is claimed or implied by this PR. Per the standing discipline: open, drive the exact head to a fresh PASS, stop. Merge only under a separate owner instruction bound to the exact reviewed head SHA; a green PR is not merge authority.

Тип изменения

• feat — новая возможность
• fix — исправление бага
• docs — документация
• refactor / chore / test / ci — без изменения поведения

Как проверено

The check for a docs reconciliation is a set of reproducible greps plus a re-read, not "looks right".

Primary-state proof (gates the Windows flip). Live #250 re-read from GitHub after the issue edit; the mirror is present in its Still missing list, and the body is otherwise byte-identical to its pre-edit image:

- the Windows output-behaviour change owed at the Rust cutover (surfaced by #261's
  261.B measurement): Rust emits canonical UTF-8 portably, and native-Windows Python
  byte parity is **not** claimed — recorded in #262 as a declared behaviour change
  rather than a parity gap, with #262 the tracker of record;

Stale-anchor greps on this head, over exactly the three files — all zero:

$ F="docs/proposals/P-022-rust-core-migration.md docs/proposals/README.md rust/README.md"
$ for a in "the owner closes #261 by hand" \
           "the owner closes the issue" \
           "blocked by #261 — the production OwnIR executable alone" \
           "the owner closes #261 by hand after review, and that is a bookkeeping step" \
           "the #250 roadmap mirror pending reconciliation"; do
    printf '%2d x %s\n' "$(grep -o -F -- "$a" $F | wc -l)" "$a"
  done
 0 x the owner closes #261 by hand
 0 x the owner closes the issue
 0 x blocked by #261 — the production OwnIR executable alone
 0 x the owner closes #261 by hand after review, and that is a bookkeeping step
 0 x the #250 roadmap mirror pending reconciliation

The full anchor is matched for the bookkeeping note rather than the bare word, so a future historical paragraph is not a false trigger. A repo-wide grep for the same anchors also returns zero, so no fourth surface was left behind.

Reconciled phrases present and truthful (each checked against live GitHub, not against prose): #261 closed completed 2026-09-08 (PR #347, 206e9c7) ×1 — live #261 is state=closed, state_reason=completed, closed_at=2026-09-08T15:18:25Z, closed by PR #347; mirrored in #250's Still missing list ×4 — live #250 carries both tails; #261 261.B landed; #261 closed completed ×1.

Diff review. git diff --word-diff confirms the changed words are exactly the status language above and nothing else; markdown table pipe-counts are unchanged on every edited row; only three files are touched.

• python tests/run_tests.py
• ruff check . и mypy
• python3 scripts/render_checkpoint_status.py --check → checkpoint status fragments OK: ... in sync with the evidence (rc 0); no docs/generated/ fragment is touched by this PR.

The Python suites were not run locally: this PR changes no Python, no fixture and no generated fragment. CI runs on every push and is the gate.

Связанные issue

Refs #250, #261, #262. Closes nothing — Checkpoint 0 is a precondition for #262's Stage 1, not a step of it.

Чеклист

• изменение покрыто тестом/селфтестом (или объяснено, почему нет) — docs-only status reconciliation; the executable check is the reproducible stale-anchor grep set above plus render_checkpoint_status.py --check
• README/docs обновлены при необходимости — this PR is the docs update
• коммиты в conventional-commit стиле (feat:, fix:, docs: …) — docs: reconcile the P-022 status surfaces with live #261/#250 state (Checkpoint 0)

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