refactor(core): delete leftover src/lifecycle barrel

[Drswith]

Summary

L4 lifecycle internalization: retarget remaining callers from the leftover src/lifecycle barrel onto Core-internal modules, then delete src/lifecycle/. This is an independent OpenSpec change (lifecycle-barrel-core-internal-l4) after L3 (#724). It does not expand the published SDK and does not add src/core/lifecycle/index.ts.

Delete list

Path	Role after L3	L4 action
src/lifecycle/index.ts	non-SDK barrel re-exporting Core-internal helpers	deleted
src/lifecycle/	directory containing only that barrel	deleted (no shim)

Not deleted: src/core/lifecycle/*.ts (model, binding, evidence, observation, planner, execution, postcondition). test/lifecycle/ stays; those files test Core-internal modules.

Remaining caller retarget

Importer	Before	After
src/services/lifecycle-execution-production.ts	barrel LifecycleOutcome	../core/lifecycle/model
src/idempotency/lifecycle-policy.ts	barrel receipt/binding types + observeLifecycleProvider / equality / receipt binding	../core/lifecycle/model, provider-binding, provider-evidence
related tests (test/commands/{inspect,doctor,resolve}, test/command-runtime, test/compatibility/agent-inspection, test/idempotency/lifecycle-policy, test/services/lifecycle-{observations,updates}, test/lifecycle/*)	src/lifecycle	matching src/core/lifecycle/*

No src/core/lifecycle/index.ts.

Ownership locks

• src/lifecycle/ is absent (barrel and former engine paths)
• src/core/lifecycle/index.ts is absent
• src/core/lifecycle/ contains only the seven Core-internal modules
• lifecycle-execution-production and lifecycle-policy import Core-internal modules, not ../lifecycle
• related tests no longer import src/lifecycle
• src/state Core imports remain leaf-only (../core/lifecycle/model)
• published SDK root does not export lifecycle helpers; runtime export remains createQuantex

SDK non-export checklist

• src/core/index.ts does not export lifecycle helpers or ./lifecycle
• packages/core/src/index.ts does not export those symbols
• No new packages/core export subpath
• No src/core/lifecycle/index.ts barrel

Freeze checklist

• State schema remains v2; receipt JSON field names/requiredness/meanings unchanged
• --json / NDJSON still omit engine / route
• Aliases and exit codes untouched
• No command/SDK expansion; no fold of config/capabilities/commands/schema
• YAML / release-core.yml / protect-main untouched
• Shelved OpenSpec changes untouched: release-one-line-delivery, release-pr-skip-human-heuristics, windows-ci-advisory-merge-gate
• Did not touch L2/L3 OpenSpec archive paths

Linked Artifacts

• OpenSpec: lifecycle-barrel-core-internal-l4
• ADR: docs/adr/0014-core-internal-lifecycle-barrel-deletion.md
• Discussion: follow-on to L3 (refactor(core): move remaining lifecycle engines into Core-internal #724), L2 (refactor(core): move lifecycle provider-binding into Core-internal #723), L1 (refactor(core): move lifecycle model into Core-internal leaf #721), and P8 leftover scan (chore: P8 KEEP leftover scan for lifecycle→Core #717)

Validation

• bun run memory:check
• bun run lint
• bun run format:check
• bun run typecheck
• bun run test — 176 files / 2147 passed / 5 skipped
• bun run openspec:validate — 28 passed / 0 failed
• Freeze smoke: install/ensure opencode --dry-run --json → ok=true, warnings[0].code=DRY_RUN, data.changed=false, exit 0, no engine/route
• SDK import keys remain ["createQuantex"]
• Ownership tests: lifecycle-core-ownership + import-purity + core-boundary — 17 passed

Release Intent

• Release: not applicable - internal leftover deletion; no user-facing CLI or SDK change. Changelog framing is refactor: / Internal Improvements and does not bump on its own.

Release Summary

• Not applicable - this source PR does not produce a release entry.

Docs Updated

• openspec/changes/lifecycle-barrel-core-internal-l4/
• docs/adr/0014-core-internal-lifecycle-barrel-deletion.md
• AGENTS.md (thin pointer to ADR 0014; drop src/lifecycle/)

Scope Check

• I did not add a new ad hoc root-level Markdown file.
• I updated the relevant ADR, OpenSpec change, and AGENTS.md pointer.
• I did not silently expand into SDK exports, YAML, shelved OpenSpec changes, or L2/L3 archive paths.

Closure Check

• Working tree was clean after commit.
• Branch was pushed and this PR is the active delivery artifact.
• OpenSpec change lifecycle-barrel-core-internal-l4 is still active until this merge, then queued for agent-driven archive closure.
• Release is not applicable (internal refactor; no version bump from this knife).

Notes

• Draft kept (requested as draft — do not mark ready).
• Delete list is only src/lifecycle/index.ts and the src/lifecycle/ directory. Core-internal modules stay. test/lifecycle/ stays.
• Archive closure waits on merge; this is a complete L4 change, not an umbrella milestone. L2/L3 archive stay separate PRs. L3 archive MUST NOT re-assert that the leftover barrel exists after this lands.