fix(pre-commit): keep key order in pretty-format-json so apm-owned JSON survives

pretty-format-json sorts object keys by default, but apm emits insertion
order and `apm audit --ci` diffs its output byte-for-byte. A file in the
formatter's scope therefore drifts on every commit with an empty git diff.

Pass --no-sort-keys so `.claude/settings.json` and `.claude/apm-hooks.json`
round-trip untouched and drop them from the exclude. marketplace.json stays
excluded: it carries literal em dashes the formatter re-escapes to —.

tests/test-pretty-json-tool-owned.sh runs the repo's real autofix hooks over
copies of the four tracked apm-owned files and fails if any is rewritten, so
losing the flag fails a test instead of surfacing as drift.

Refs: #102

Co-Authored-By: Claude Code <[email protected]>
Claude-Session: https://claude.ai/code/session_01KkT7RSDwDbmrM9T34b6sTi

LESSONS.md

@@ -128,7 +128,7 @@ Widening a description-opener rule to also catch mid-sentence text looked like a
 
 ## 2026-08-14 — A formatter in the commit path manufactures drift on a file with a clean git diff
 
-`apm audit --ci` failed on `.claude/settings.json` with an empty `git diff` — `pretty-format-json --autofix` silently re-sorts JSON keys, and this generated file was missing from its exclude list, so every commit re-sorted apm's insertion-ordered output before apm compared against it. Separately, a defect introduced 3 hours earlier on the same branch was first mis-described as "pre-existing," an unverified claim about history. Fix: add tool-owned paths to every autofixing hook's exclude the moment ownership is declared, and verify "pre-existing" claims with `git log -S` or `git branch --contains` before writing them down.
+`apm audit --ci` failed on `.claude/settings.json` with an empty `git diff` — `pretty-format-json --autofix` silently re-sorts JSON keys, and this generated file was missing from its exclude list, so every commit re-sorted apm's insertion-ordered output before apm compared against it. Separately, a defect introduced 3 hours earlier on the same branch was first mis-described as "pre-existing," an unverified claim about history. Fix: add tool-owned paths to every autofixing hook's exclude the moment ownership is declared (for JSON, superseded by #102: `--no-sort-keys` makes the exclude unnecessary, and `tests/test-pretty-json-tool-owned.sh` pins it), and verify "pre-existing" claims with `git log -S` or `git branch --contains` before writing them down.
 
 ## 2026-08-16 — A rule reversed inside a retrofit leaves no trace unless someone writes it down (historical)