[rasuvaeff]

Fixes #1
Fixes #2
Fixes #3
Fixes #4

Release 0.2.0 folded in (CHANGELOG.md ## 0.2.0 — 2026-10-11).

Changes

#1 — detach terminated children; unsubscribe

• A terminated ContextState detaches from its parent and drops its listeners and children, so a long-lived parent no longer retains every cancelled/expired child it derived. A child derived from an already-terminated parent is terminated and not retained.
• withValue() shares its parent's state (it has no controller), instead of attaching one new child per call.
• onTerminate() returns an unsubscribe \Closure(): void (idempotent; no-op once the listener ran). roave reports no break (final class, callers ignoring the value unaffected); released as 0.2.0 by decision.

#2 — withTimeout() overflow

• Non-positive timeout → immediate deadline (now); a timeout beyond the representable range saturates at PHP_INT_MAX instead of overflowing via an out-of-range float→int cast.

#4 — portable deadline: documented the pattern (send (int) remainingMs(), rebuild with withTimeout($ms / 1000) capped by the receiver's limit) and pinned it with a test. No new API.

#3 — docs and tests

• README/llms.txt placeholders replaced with the real API reference; README.ru.md added; leftover migration template removed from AGENTS.md; CHANGELOG 0.1.0 entry now says what 0.1.0 contains.
• Property tests: cancelling a node terminates exactly its subtree (random trees, Classify::cover, examples); value lookup finds the nearest ancestor. Existing deadline properties kept.

Also: ContextExpiredException takes an optional $previous (for context-http to keep the transport timeout as the cause); regression-corpus restore/PROPERTY_DB/save steps in the coverage job (zizmor clean); multi-line @api docblocks.

Verification (local)

• composer build: green (38 tests).
• Mutation: covered MSI 92 % (minMsi 85). New code leaves only the two equivalent mutants at the saturation boundary (>=/> and a float cast); the other 5 survivors predate this PR.
• composer rector: clean. composer bc-check: Detected last version: v0.1.0, no backwards-incompatible changes.
• php -l on PHP 8.3: clean. bin/package-audit: 0 errors. zizmor --persona=auditor .github/: no findings.

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