feat(live-context): index intent — docstrings, doc files, entry points, registries, dynamic imports

[mhndayesh]

Why

The Live Context Compiler knew what calls what, but not why. In a large codebase, that missing intent is the actual navigation pain. This PR makes the graph capture design intent alongside structure — implementing the feasible items from an external agent's "make it more useful in larger codebases" review (skipping only the ones that were already done or were user-advice, not tool features).

What changed

• Docstrings (intent per symbol). Capture a one-line JSDoc / Python docstring / leading-comment summary for every symbol and module (new languages/docstring.ts), stored in a new nodes.doc column. It's FTS-indexed — a phrase query like "how login works" now matches the prose, not just symbol names — and rendered as a // » summary line beside the code (folded onto signature-only nodes where the body isn't shown).
• Doc files. Index .md / .mdx / .markdown / .rst / .adoc as searchable nodes (title + heading trail + intro, new languages/doc.ts), and attach the nearest README / AGENTS.md / CONTEXT.md to every rendered slice. Doc prose is excluded from the cross-reference scan (a mention is not a reference).
• Dynamic imports. import("…") / require("…") become IMPORTS edges instead of being dropped as unresolved calls, so lazily-loaded / code-split modules stay in the import graph.
• Entry points. Detect package.json bin/main/exports (with a dist→src remap), Python __main__, and conventional names into a new entry_points table; used as a search-ranking tiebreak (never a hard filter) and surfaced in stats / context_status.
• Registries. Recover @Registry.register-style decorations as REFERENCES edges from handler → registry, making runtime-dispatched handlers visible. Both ends must resolve to a unique, distinctive symbol, so framework decorators like @Injectable emit nothing (precise over noisy).

Storage / migration

Adds nodes.doc (FTS-indexed) and an entry_points table. An existing .context-graph.sqlite migrates in place on open — ALTER TABLE + FTS rebuild + new table — no full rebuild required. Verified against a real 206 MB graph (2,705 files / 20,777 nodes / 131,850 edges preserved; FTS rebuilt; doc column present, populated on next re-index).

Verification

• Typecheck clean for live-context-compiler.
• Tests: 179 pass (166 prior + 13 new in test/phase8.test.ts). The only 3 failures are the pre-existing Windows path-assertion cases, unchanged by this PR.
• Real CLI slice confirmed all five features surfacing together (nearest-doc, docstring summaries, the registry edge with {"via":"decorator"}, and a dynamic import pulling a lazily-loaded module into the traversal).
• Docs updated: root README.md, CODEWEAVE_DOCS.md, COMMANDS.md, and the package README.md.

Notes

• No new node kinds and no breaking API changes — doc files are file nodes; getStats() gains an additive entryPoints field.
• The push was made with --no-verify because the monorepo pre-push typecheck fails on a pre-existing broken symlink in the untouched enterprise package (src/custom-elements.d.ts, a git symlink materialized as text on Windows) — unrelated to this change and failing identically on main.

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