Implement bidirectional sync v2 for SchLib, PcbLib, SchDoc, and PcbDoc

[akiselev]

Summary

• introduce the altium-spec-lang source/intent boundary with lossless source retention, source IDs, generic top-level resource discovery, and explicit inherit / set / clear / reset semantics
• implement altium-sync as a three-way synchronization engine with durable bindings, versioned external baselines, conservative conflict classification, persisted self-contained plans, semantic ECO rendering, and transactional apply helpers
• route SchLib, PcbLib, SchDoc, and PcbDoc plan/apply/dump through sync v2
• make saved plans executable in both directions
• materialize exact Altium document bytes at plan time; document apply stages/reopens/verifies/commits those exact bytes instead of re-running mutation logic
• use exact source patches for dump plans
• fix stale PR CI references to the removed altium-format-ops package

CLI

altium plan design.pcbdoc-spec --target design.PcbDoc --out-plan design.plan.json
altium apply --plan design.plan.json

altium dump design.PcbDoc --plan --out-plan design.dump-plan.json
altium apply --plan design.dump-plan.json

Plan drift now exits with status 2; errors remain status 1.

Safety properties

• apply never re-plans
• source/document/baseline preconditions reject stale plans, including file creation/deletion races
• document-only drift blocks compile; source-only drift blocks dump
• simultaneous drift conflicts instead of being guessed as the same change
• no fuzzy identity matching
• whole-file semantic coverage prevents syntax outside discovered resource blocks from escaping drift detection
• document mutation is staged, reopened through altium-format, semantically verified, journaled, then committed
• baselines advance only after successful apply

Validation

• cargo fmt --all -- --check
• cargo test -p altium-spec-lang -p altium-sync -p altium-cli
• corpus-backed workspace tests with SchLib, PcbLib, SchDoc, PcbDoc, and IntLib fixture repositories mounted; seven pre-existing tests requiring the unavailable root fixture data/BlankSchlibComponent.SchLib were skipped
• final head: warnings-as-errors Clippy for altium-spec-lang and altium-sync; normal no-deps Clippy for CLI integration (the CLI has pre-existing lint debt outside this change)

Scope / follow-ups

• PrjPcb and IntLib remain on legacy orchestration
• planning still uses the existing altium-format-spec semantic materializer behind the new planner boundary; apply correctness is independent of it because document plans carry the exact materialized CFB bytes
• durable per-primitive bindings for every keyless PcbDoc/PcbLib primitive are represented by the identity model but remain conservative/aggregate in this PR where a trustworthy persistent mapping is not yet available
• PcbDoc compile still requires an existing target
• journaled commit/rollback exists; automated crash-recovery replay is not part of this PR