Add inline script environment lifecycle telemetry (PEP 723 PR 15/16)

[StellaHuang95]

Draft fork-review PR. Do not send upstream yet.

Summary

• add inlineScript.envCreated
• add inlineScript.envReuseHit
• add inlineScript.envError
• define typed GDPR-safe schemas and stable low-cardinality error categories

Semantics

• emit creation only after verified environment creation and sidecar persistence
• measure actual build/rebuild duration, excluding lock wait and cache inspection
• emit reuse only after complete cache validation
• emit one lifecycle result for an underlying coalesced operation rather than per waiter
• distinguish discovery failure, no compatible Python, user decline, install failure, package cancellation, lock timeout, and unavailable retained/orphaned locks
• send no URI, path, version, dependency value, requirement, package name, or error-message content
• preserve existing uv prompts, installation behavior, and uv telemetry

Scope

This is telemetry-only. It does not add routing, discovery, cleanup, UI, project registration, retries, or cache algorithm changes.

Validation

• TypeScript test compilation
• ESLint and diff checks
• focused unit suite: 137 passing
• two manual telemetry/code-path review passes; no significant findings remain

[StellaHuang95]

Closing this PR in favor of a clean-history replacement with the same current reviewed file changes.

[StellaHuang95]

Superseded by clean-history replacement #10.