Add architecture review findings and address documentation issues

Review of all ADR documents (001-007) and peripheral architecture docs
identified 3 critical, 10 warning, and 7 suggestion issues.

Addressed in this commit:
- W-1: Add draft qualifier to ADR-002 reference to incremental exploration
- W-2: Add Alternatives Considered section to ADR-001
- W-3: Add Document Lifecycle section to README.md (draft/stable/deprecated)
- W-4: Clarify includeCompleted semantics (only 'completed' status triggers exclusion)
- W-5: Document file I/O runtime constraints in frontmatter.md
- W-6: Add ADR reference to architecture.md redirect
- W-7: Verify CVE-2025-64718 (confirmed real, improved description)
- W-9: Convert workspace-absolute paths to relative/monorepo references
- S-7: Add future ADR-008 note to incremental-update-exploration.md

Critical issues (C-1, C-2, C-3) and remaining warnings (W-8, W-10, S-4, S-5)
were addressed by a parallel agent in a prior commit.

All 16 review tasks created and resolved.

docs/architecture/incremental-update-exploration.md

@@ -5,7 +5,7 @@ last_updated: 2026-04-26
 
 # Incremental Update Architecture Notes
 
-**Draft exploration** — not yet a decision. This document explores whether incremental updates (via TypeBox Diff/Patch → graphology mutation mapping) could replace or complement the current "rebuild on change" approach.
+**Draft exploration** — not yet a decision. This document explores whether incremental updates (via TypeBox Diff/Patch → graphology mutation mapping) could replace or complement the current "rebuild on change" approach. If this exploration leads to a decision, it will become ADR-008.
 
 ## Current Approach: Rebuild on Change
 
@@ -168,7 +168,7 @@ The key insight is that **the win is reactivity, not performance**. For <200 nod
 ## References
 
 - ADR-002: Rebuild vs Incremental → [decisions/002-rebuild-vs-incremental.md](decisions/002-rebuild-vs-incremental.md)
-- TypeBox Diff/Patch: `/workspace/@alkdev/typebox/docs/values/diff-patch.md`
-- Graphology mutation API: `/workspace/graphology/docs/mutation.md`
-- Graphology serialization (import/export): `/workspace/graphology/docs/serialization.md`
-- POC: `/workspace/lbug_test/convert_graphology.ts`
+- TypeBox Diff/Patch: [../../node_modules/@alkdev/typebox/docs/values/diff-patch.md](../../node_modules/@alkdev/typebox/docs/values/diff-patch.md) (monorepo: `@alkdev/typebox/docs/values/diff-patch.md`)
+- Graphology mutation API: [Graphology docs on GitHub](https://graphology.github.io/standard-library/mutation.html)
+- Graphology serialization (import/export): [Graphology docs on GitHub](https://graphology.github.github.io/serialization.html)
+- POC: `lbug_test/convert_graphology.ts` (monorepo-internal)