feat(graph): LSP code-graph provider + Chrome auto-launch, slimmer CLI

[burrows99]

graph (code exploration):

• Drive a language server over LSP call hierarchy (prepareCallHierarchy + callHierarchy/outgoingCalls) to build the outgoing-call flow tree — the same engine an IDE's "Show Call Hierarchy" uses. Type-accurate across DI, interfaces and files; language-agnostic.
• Auto-detect the project root (nearest tsconfig/package.json/.git) and pick the LSP server by file extension; TS/JS bundled, others via --server.
• Entry as file:line[:col] or file@symbol; --depth bounds the walk.
• Trimmed the surface: dropped --provider, --max-nodes, --include-external.

dynamic (Chrome) — auto-launch:

• --chrome with no port now launches a throwaway headless Chrome (trace → record → teardown); --chrome <port> still attaches to a real/auth'd session.
• New shared ChromeLauncher (OS free-port, temp profile, readiness poll, cleanup), also adopted by the recorder (removes its private launcher + duplicate paths).

docs:

• README "Code graph" section + cross-language matrix; Chrome attach-vs-launch; roadmap reflects the static pillar shipping. SKILL.md description updated for discoverability. Removed a stray demo artifact.

tests: ChromeLauncher integration test (launch + distinct ports). Suite green (25 pass, 1 Postgres skip).