…#898) (inkeep#3268)

* Introduce check:fast tier for in-vivo agent verification (G1)

Closes G1 from the merge-gates audit (inkeep#892): "No check:fast script tier
— Layer 1 (in-vivo) is undocumented for agents."

Adds `check:fast` as the canonical fast-verification command name across
root + 6 subtrees. Aliased to each subtree's existing `typecheck` (the
fastest reliable signal of real errors). Agents doing in-vivo iteration
inside a subtree can now run `pnpm check:fast` (or `bun run check:fast`
in OK) regardless of subtree — same command name, subtree-appropriate
implementation.

Scope:
- Root `check:fast` fans out to all 6 subtrees with typecheck coverage
  (matches existing `typecheck` root fan-out shape)
- Per-subtree `check:fast` script added; each aliases the subtree's
  existing typecheck command verbatim (no behavior change, just a
  named alias for discoverability)
- subtrees: public/agents, public/open-knowledge, private/agents-ui,
  private/chat-to-edit, private/copilot-app, private/copilot-chrome-extension

Why typecheck and not something broader:
- typecheck catches the most common in-vivo error (type mismatches,
  missing imports, broken refactors) with cache hits in <10s warm
- No tests: tests are slow and not in-vivo-fast
- No lint: lint is fast but typecheck already covers most real bugs
- No format:check: pre-commit's lint-staged covers that

This is naming, not new behavior. If we later want check:fast to mean
something different (e.g., typecheck + lint), the alias changes in one
place per subtree. The name is the durable contract; the implementation
is a script value.

Local verification: `pnpm --dir public/agents check:fast` runs `turbo
typecheck` correctly, 5.2s with 14/16 cached. (One pre-existing
typecheck error in agents-manage-ui — react-google-recaptcha-v3 types
missing — surfaced; that's on main, unrelated to this PR.)

Follow-up: update .github/QUALITY_GATES.md Layer 1 to reference
`check:fast` once inkeep#892 lands (QUALITY_GATES.md doesn't exist on this
branch yet — it's introduced by inkeep#892).

* Address PR inkeep#898 review: fold check:fast → typecheck alias (eliminates drift risk)

pullfrog[bot] flagged that the previous shape duplicated each subtree's
typecheck command verbatim under a `check:fast` key — 6 independent
string literals had to stay in lockstep with the matching `typecheck`
strings. A future PR changing a subtree's `typecheck` (e.g. adding a
`--filter` exclusion) could silently forget the `check:fast` twin and
the two would diverge.

Fix: each subtree's `check:fast` now invokes `pnpm typecheck` (or
`bun run typecheck` for OK) — a literal alias of the existing typecheck
script in the same package.json. The typecheck script stays canonical;
check:fast is its discoverable name. Single source of truth per subtree,
zero drift surface.

Per-subtree:
- public/agents: `check:fast: pnpm typecheck` (delegates to existing
  `typecheck: turbo typecheck --filter='!agents-cookbook-templates'`)
- public/open-knowledge: `check:fast: bun run typecheck` (delegates to
  existing `typecheck: turbo run typecheck`)
- private/agents-ui: `check:fast: pnpm typecheck`
- private/chat-to-edit: `check:fast: pnpm typecheck`
- private/copilot-app: `check:fast: pnpm typecheck`
- private/copilot-chrome-extension: `check:fast: pnpm typecheck`

Local verification (alias chain runs end-to-end):
- `pnpm --dir public/agents check:fast` → invokes typecheck → 16/16 turbo
  tasks success, 14/16 cached, 1m3s cold
- `pnpm --dir private/agents-ui check:fast` → recursive typecheck across
  packages/agents-ui, packages/react, packages/docusaurus — all green

(pullfrog's second finding about other AGENTS.md docs still referencing
`pnpm typecheck`: addressed in PR body reply — keeping deferred since the
alias means existing docs aren't wrong, just don't surface the new name.)

GitOrigin-RevId: 86ed0df4b6e7d9fa68bd67adb0df85661f61e055

Co-authored-by: Varun Varahabhotla <vnv-varun@users.noreply.github.com>