refactor(core): move lifecycle model into Core-internal leaf

[Drswith]

Summary

L1 lifecycle internalization: move receipt/observation types and LIFECYCLE_RECEIPT_SCHEMA_VERSION from src/lifecycle/model into a Core-internal leaf at src/core/lifecycle/model.ts. This removes the start of the Core → src/lifecycle reverse dependency without expanding the published SDK.

P8 (#717) kept the file outside Core because a naive fold would invert state → Core. The architecture conclusion (ADR 0011): state may import the leaf, never Core runtime. The leaf has zero imports, so Core → state → leaf is a chain, not a cycle. Remaining src/lifecycle/* engines stay in place for L2+.

Before / after import map

Importer	Before	After
src/core/installation-production.ts	../lifecycle/model (+ receipt version from state/schema)	./lifecycle/model
src/core/installation-state-record.ts	../lifecycle/model	./lifecycle/model
src/core/uninstall-executor.ts	../lifecycle/model	./lifecycle/model
src/core/update-executor.ts	model types/constant from ../lifecycle barrel	./lifecycle/model (planner types still from ../lifecycle)
src/core/execution-executor.ts	model types from ../lifecycle barrel	./lifecycle/model (preflight still from ../lifecycle)
src/state/{schema,store,index}.ts	../lifecycle/model	../core/lifecycle/model only (no Core runtime)
src/package-manager/index.ts	../lifecycle/model	../core/lifecycle/model
remaining src/lifecycle/*	./model	../core/lifecycle/model
src/lifecycle/index.ts barrel	./model	re-exports leaf (existing non-SDK path)
tests that imported src/lifecycle/model	that path	src/core/lifecycle/model

Unchanged for L2+: Core still imports provider-binding, observation, update-planner, agent-execution, uninstall-postcondition, and the barrel.

SDK non-export checklist

• src/core/index.ts does not export LifecycleReceipt, LifecycleObservation, LIFECYCLE_RECEIPT_SCHEMA_VERSION, or ./lifecycle
• packages/core/src/index.ts does not export those symbols
• Runtime export remains createQuantex only (test/core/import-purity.test.ts)
• No new packages/core export subpath
• Existing non-SDK re-exports only: src/lifecycle barrel and src/state/schema (LIFECYCLE_RECEIPT_SCHEMA_VERSION)

Freeze checklist

• State schema remains v2; receipt JSON field names/requiredness/meanings unchanged
• --json / NDJSON still omit engine / route (existing command tests)
• 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 start L2+ (no move/delete of remaining src/lifecycle/*)

Linked Artifacts

• OpenSpec: lifecycle-model-core-internal-l1
• ADR: docs/adr/0011-core-internal-lifecycle-model-leaf.md
• Discussion: follow-on to 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 / 2141 passed / 5 skipped
• bun run openspec:validate
• Freeze smoke: install/ensure --dry-run --json → ok=true, warnings[0].code=DRY_RUN, data.changed=false, exit 0, no engine/route
• SDK import keys remain ["createQuantex"]
• CI green on head 7503e24: lint, governance, test (ubuntu/windows/macos)

Release Intent

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

Release Summary

BEGIN_COMMIT_OVERRIDE
refactor(core): move lifecycle model into Core-internal leaf
END_COMMIT_OVERRIDE

Docs Updated

• openspec/changes/lifecycle-model-core-internal-l1/
• docs/adr/0011-core-internal-lifecycle-model-leaf.md
• AGENTS.md (thin pointer to src/core/lifecycle/ and runtime-boundaries)

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 L2+, SDK exports, YAML, or shelved OpenSpec changes.

Closure Check

• Working tree was clean after commit.
• Branch was pushed and this PR is the active delivery artifact.
• OpenSpec change lifecycle-model-core-internal-l1 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 after CI (requested as draft — do not mark ready).
• Ownership tests now lock: src/lifecycle/model.ts absent; src/core/lifecycle/ contains only model.ts; src/state Core imports are leaf-only.
• Archive closure waits on merge; this is a complete L1 change, not an umbrella milestone.