fix(cli): meta init --refresh-docs must not re-scaffold or regress stack in a monorepo (#163)

[dmealing]

Fixes #163.

Two coupled bugs

1. --force cancelled the refresh-only short-circuit → full project re-scaffold.
The early return in init() was gated on !opts.force, so meta init --refresh-docs --force fell through to the full scaffold path and re-created metaobjects/, metaobjects.config.ts, codegen/generators/, .metaobjects/config.json, and package.meta.json (and scaffolded into sibling packages). Refresh now short-circuits whenever the project exists, regardless of --force. --force on this path instead means "overwrite hand-edited docs in place rather than writing the .new sidecar."

2. Refresh re-detected the stack from a root-only probe, discarding the correct persisted stack.
writeAgentContext re-detected from package.json deps + filenames at the repo root only. On a monorepo the client (React/TanStack) deps live in a sibling package, and a Maven-built Kotlin server has no gradle file — so detection collapses to java server, no client, and the refreshed docs regress (and shrink, since a narrower stack assembles fewer skill reference fragments). The correct stack is already persisted in .metaobjects/.agent-context.json; a new stackForAgentContext helper reuses it, with precedence explicit --server/--client > persisted manifest > detection.

Scope: TS-CLI-only — no cross-port change, no conformance fixture

meta init / --refresh-docs / stack-detection are the Node TS CLI's. The other ports only expose agent-docs, which redirects to the Node CLI (Python literally prints npx meta agent-docs). This is CLI scaffolding, not metamodel behavior — so there's nothing to fan out and no conformance corpus involved.

Tests

Adds regression coverage in init-refresh-docs.test.ts (each fails against pre-fix code):

• --refresh-docs --force refreshes docs only — does not re-scaffold the project.
• --refresh-docs --force overwrites a hand-edited doc in place (no .new).
• refresh preserves a persisted multi-package stack instead of re-detecting.

Full CLI suite green (361 pass), typecheck clean. Reviewed for correctness + simplified (single-ternary stack helper); the persisted-stack preference intentionally governs the shared --force/--docs-only paths too (documented in the helper).

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