skill-quality: detect and fix SKILL.md overspecification

[christso]

Summary

Adds overspecification detection guidance to skill-quality-checklist.md — the anti-pattern of inlining rule prose, operational procedures, and worked examples into SKILL.md when they belong in `references/`.

Motivation

WTG.AI.Prompts PR #679 turned a 33-line routing SKILL.md into a 94-line / 1168-word file by adding: a 5-item Review Checklist (each item restating a rule already in `references/`, ending with "see `references/foo.md`"), a 20-line schema-verification procedure, and a citation discipline section with worked examples. The intent was legitimate (deterministic coverage, consistent output shape) but the mechanism was wrong — inlining instead of using the lighter primitives that already exist.

Sections touched in `skill-quality-checklist.md`

• Content Quality → Conciseness: diagnostic rule — "When SKILL.md exceeds ~500 words, the heaviest section is almost always inlined reference material — extract it"
• Content Quality → Coverage Contracts vs. Rule Restatement (new subsection): coverage-contract pattern (one-line item + cite reference + "silence is a gap" + "say so if unavailable") vs. the anti-pattern of multi-paragraph items that duplicate `references/`
• Anti-Patterns to Flag: two new rows — inlined rule prose; embedded operational procedures/worked examples
• Discipline-Enforcing Skills: two new bullets — discipline patterns belong in `references/`, mark the file as always-load rather than inlining for coverage

Also included (pre-existing breakage on main)

• Tests: fix two failures introduced by `feat(studio): default to projects dashboard ([codex] Default Studio to projects dashboard #1265)` — `resolveDashboardMode(0, {})` expectation and `resolveIndexRoute` call with wrong argument order
• Lint: fix pre-existing biome format/type errors in `remote.ts`, `serve.ts`, `EvalDetail.tsx`, `StopRunButton.tsx`, `routes/index.tsx`

[cloudflare-workers-and-pages]

Deploying agentv with    Cloudflare Pages

Latest commit:	1d32792
Status:	✅  Deploy successful!
Preview URL:	https://37315783.agentv.pages.dev
Branch Preview URL:	https://skill-quality-overspecificat.agentv.pages.dev

View logs