docs: debloat CLAUDE.md

[benbaarber]

CLAUDE.md had grown to ~46KB, much of it functioning as a changelog rather than working guidance. This cuts it to ~24KB (74 insertions, 130 deletions) while keeping everything sessions actually use.

Removed:

• The per-crate test-count inventory. Checking past agent sessions in this repo: 13 of the 14 sessions that mention test counts were updating them, not using them — the block generated maintenance chores, not answers.
• The copilot 1.0.67 verification narrative, which appeared twice (dependency-graph section and a ~3,900-char Things-to-know bullet). The durable part — the loader's writer contract — lives in docs/agents/formats/copilot-cli/writing-compatible.md, which stays pointed at.
• Historical narration in Things to know ("used to emit", "now observed at 1.0.68", issue links) — the rules those stories justified are kept as rules; the stories belong to CHANGELOG.md and git history.
• Formulaic CLI variants derivable from --help (per-provider import/list/export lines), the duplicated cross-dependency and desktop-app paragraphs, and two zero-evidence one-liners (externally-tagged Document note, ExecStrategy clause).

Kept intact: the release checklist (the most-consulted section — referenced in 18 of the 57 sessions in this repo), key conventions, every correctness invariant (token accounting, breakdowns, sync semantics, planner never changes an answer), the operational gotchas (TOOLPATH_CONFIG_DIR, TOOLPATH_QUERY_EXPLAIN, shim --manifest-path, missing redeem operation, plugin $PWD rule), and the docs/agents/formats/ pointers. Things to know is now organized under subheadings so future additions have a place to land.

Note: #138's parallel-execution sentence in the query bullet is deliberately absent here since it describes unmerged work; that branch re-adds it when it lands.

---

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}

[github-actions]

🔍 Preview deployed: https://aff0cff6.toolpath.pages.dev