FE-843: Expand cook toolchain profiles, selected at plan time

[kostandinang]

Stack Context

Stacks on FE-841 (#194). Expands the FE-829 toolchain contract so brunch cook can build on more technologies than bun, and so the profile selection path actually works.

What?

• Data-driven profile registry (project-profile.ts) -- profiles are data literals (path templates + argv template + conventions prose) compiled into the unchanged Toolchain interface. Adds node-vitest, node-test, node-jest, deno alongside bun/brunch; registry invariants pinned enumerably over every entry. Adding a runtime = one data entry.
• Live + strict selection -- brunch plan --profile=<id> (validated); the emitter resolves the chain once (--profile flag >> spec profile >> architect-classified >> bun) and stamps the resolved id into plan.yaml on both the authored and fallback paths, so cook always reads the profile the emitter used (I130-K). resolveToolchain now throws UnknownProfileError on a typo'd id instead of silently running bun; absent stays lenient for hand-authored fixtures.
• Architect classifies the stack from spec prose -- optional profile enum on the architectPlan schema (null when the spec is silent); a hallucinated id fails schema parse and rides the existing deterministic fallback. No host introspection (D160-K intact).

Why?

Before this branch both implemented profiles were TypeScript and the selection path was dead -- nothing populated snapshot.profile, so every cook run silently resolved to bun, and a typo'd profile id silently defaulted rather than erroring. Adding profiles without live selection changes nothing at runtime; live selection without strictness hides real misconfiguration.

Deliberately not included (recorded in PLAN as follow-ons): a harness install verb (the cook agent scaffolds + installs per A98), fail/infra test-outcome split, brownfield drift-check at cook open, brunch detect. Outer-loop validation outstanding: a greenfield cook smoke with --profile=node-vitest as the conventions-prose oracle.

[kostandinang]

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• FE-864: Orchestrator improvements umbrella — brownfield feature delivery from spec #212 : 2 dependent PRs (#213 , #223 )
• FE-843: Expand cook toolchain profiles, selected at plan time #198 👈 (View in Graphite)
• FE-841: Embed pi as an in-process SDK to drop the external pi CLI dependency #194 : 1 other dependent PR (#211 )
• main

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PR Summary

Medium Risk
Changes plan emission defaults and cook runtime toolchain resolution; misconfigured profiles now fail loudly instead of silently using bun, which is intentional but affects brownfield plans with typos in profile fields.

Overview
FE-843 expands cook toolchain profiles and makes profile selection actually work end-to-end.

Profiles in project-profile.ts are now data literals compiled into the existing Toolchain interface, with new ids node-vitest, node-test, node-jest, and deno (plus bun / brunch). brunch plan --profile=<id> validates via parseProfileId and threads through runPlan into emitPlanFromSnapshot. The emitter resolves the profile once with precedence --profile ≫ snapshot.profile ≫ architect-classified ≫ bun, stamps it on plan.yaml on both success and architect fallback paths, and derives verification targets from that toolchain.

Strict resolution: unknown profile ids now throw UnknownProfileError at cook/plan time; absent profile still defaults to bun for hand-authored fixtures. The build architect gains an optional profile field in its schema and prompt (spec prose only, D160-K); invalid LLM values fail parse and trigger the existing deterministic fallback.

Tests cover registry invariants, selection precedence, CLI parsing, and architect profile behavior. memory/PLAN.md records the frontier as branch-complete.

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[kostandinang]

Follow-on work tracked in FE-864 — Orchestrator enhancements: brownfield feature delivery from spec. This branch's deferred items (structured spec-profile field, outstanding --profile=node-vitest greenfield cook smoke, install-verb / fail-infra split / brownfield drift-check / brunch detect) will be evolved there.

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