docs: trim derivable content from CLAUDE.md

[btravers]

From a /doctor pass. CLAUDE.md loads into every session, so anything a
session could reconstruct with a couple of tool calls is paid for on every
turn and gives nothing back.

6,867 → 6,457 chars (~1,716 → ~1,614 est. tokens).

Cut — derivable from the repo

The pnpm build|test|typecheck|test:types|lint|format|knip table (those are
package.json scripts), the standard pnpm vitest run <file> / -t
invocations, and the Node/pnpm pin line (.node-version and packageManager
already say it).

Kept, because it is not derivable

The two facts that block came with which nothing in the repo states:

• the order of the CI gate — CI lives in btravstack/config, not here,
  and typecheck being three passes (main tsc, .test-d.ts, and the
  consumer declaration-emit pass from fix!: let a consumer emitting declarations compile against the seal #13) is not visible from the script name
• that a single test file runs from inside packages/entity, not the root

Not cut

The Architecture section stays whole despite reading like a repo tour. Its
value is rationale rather than inventory — why only two zod slots and never
the full ZodType, why the union dispatches instead of trying each branch,
why computed re-derives — and none of that is recoverable from the code. The
Binding conventions stay for the same reason.

Also

A staleness fix, not a trim: the type-level-tests bullet still said add's
contextual typing. add became computed in #10.

Gate

format --check clean. No source touched.

[Copilot]

Pull request overview

Reduces the size of CLAUDE.md by removing command/script details that can be re-derived from the repository, while keeping non-derivable operational facts (CI gate order and the multi-pass typecheck detail) to minimize recurring context cost in agent sessions.

Changes:

• Removed the “Commands” shell snippet and other derivable operational details (script list, common vitest invocations, Node/pnpm pin note).
• Kept and reformulated the two non-derivable facts: CI gate order (including typecheck’s three passes) and the “run single test from inside packages/entity” note.
• Updated a staleness reference from add to computed in the type-level tests bullet.

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