chore(context): move stories and history out of always-loaded skills (T4)

[MendixMau]

Direct lane

What changed and why (one paragraph):
T4 from the stub-diet research report. This is a trim PR under CLAUDE.md "Always-loaded skill text — the word budget": it only moves movable text. Incident narratives, old measurements and a duplicated A/B paragraph move verbatim out of four baseline skills into process/baseline-incident-history.md, following the #315 precedent. They land as new sections UI1–UI4, TO1–TO3, MF1 and MP1, and each source keeps a one-line pointer. Rules, STOP rows and their numbers, denominators, completion criteria and the one-line failure examples stay in place. Where I wasn't sure, I left the text where it was. A new bin/check-moved-text.sh makes the mechanical half of the #315 review a command: every line removed from the sources must be found with grep -F in its new home.

Word counts (LC_ALL=C bin/render-routing.sh --check, budget 80,000)

	before (d16f578)	after
Baseline	75,028	74,223 (−805)
Stage 5 mdl	56,236	55,431
Stage 5 review	44,818	44,492
Stage 5 gate	34,629	34,303
Stage 5 test	33,689	33,363
Stage 5 lead / ba / architect	27,862 / 27,950 / 26,037	27,536 / 27,624 / 25,711
Stages P–3, all helper roles	21,106	20,780

Per file: ui-preflight-pages 3,933 → 3,553 · tool-output-is-not-ground-truth 2,888 → 2,562 · microflow-preflight 1,871 → 1,814 · learned-mdl-preflight 3,876 → 3,834.

Below the ~1.5k target, on purpose. The report's estimates for the mxcli layout block (~250) and the #879 note (~150) counted rule sentences. Once each sentence was classified, only ~57 and ~42 words of story were left in those two blocks. The ui-preflight delivery rule, with its A/B numbers, stays in place as instructed.

No-loss check:
bin/check-moved-text.sh process/baseline-incident-history.md skills/ui-preflight-pages.md skills/tool-output-is-not-ground-truth.md skills/microflow-preflight.md skills/learned-mdl-preflight.md
→ 83 of 83 removed non-blank line(s) found verbatim. Negative control: I deleted one moved line from the destination, and the script exited 1 and named that line.

Two edits that are not byte-verbatim:

• In TO1 and TO3, the moved ##/### headings are demoted one level so they don't collide with the history file's section ids. This is noted on each section's _From_ line. grep -F still finds them.
• Where a kept rule sentence shared a wrapped line with a moved sentence, I rewrapped the kept sentence in the source. The original line is in the history file verbatim.

Classification per moved block

ui-preflight-pages.md

Text	Class	Disposition
Delivery rule at top, with its A/B numbers ("a citation is not a read", dispatch must inline)	rule + failure example	kept
Step 2: "Measured 2026-09-09: 55 tokens…" paragraph	story / old numbers	moved → UI1; kept a one-line failure example: "0 of 35 knobs, 0 of 20 classes, while mx check, lint and e2e stayed green"
Step 2 B0 rule, report block with denominators, "binding UNPROVEN… silence is not"	rule / denominator	kept
Step 2 page column, "measured 2026-08-31: 10/10 drafts shipped full-bleed"	one-line failure example	kept
Step 5: "Measured, ToeicBuddy field run 2026-08-25/26" paragraph	old numbers	moved → UI2 (the Step 5 intro "wrong shell on ten pages out of ten" stays as the failure line)
"A fidelity score is not a LOOK pass…", "closes nothing… 1280px and 390px… never in place of one"	rule	kept
Fidelity vs. element-checklist table and its explanation	old numbers	moved → UI3; kept the one-liner "two screens scored 100% with 58%/40% of elements in place"
"Measured again, controlled A/B, 2026-08-31"	duplicate of the top delivery rule	moved → UI4
"The build script… cited this file's Step 3 by name…"	story / justification	moved → UI4
Stub-page rule, "Every run is stored", the v0.20 layout capability paragraph, report-back block	rule / denominator	kept

tool-output-is-not-ground-truth.md

Text	Class	Disposition
Instances 1–3: narratives ("saw 6 microflows instead of 13…", "kept flipping…", "user pushed back…", "two compounding errors", "all risk, zero benefit")	story	moved → TO1; each instance keeps a one-line failure summary
Antidote 1 (hash compare, re-run the query) and Antidote 2 (run T in isolation, instrument)	rule	kept, unchanged
Instance 3 lesson: "a tool that does not understand a sibling property cannot be trusted to round-trip a child one"	rule	kept (rewrapped)
Part 2 $? "Real instances" table	old numbers	moved → TO2; the WRONG/RIGHT code blocks and "biased toward green" stay
Part 2 constructs table, read-back rule, "count of zero and an exit code" WRONG/RIGHT	rule + failure example	kept
Part 3 "The instance" bullets and "Why it cost a day"	story	moved → TO3; kept a 4-line failure summary
Part 3 quote "A control that cannot distinguish your arms…", the rule, negative control, sensitivity ladder table, the tell, twin diff	rule	kept

microflow-preflight.md

Text	Class	Disposition
"mxcli layout is a domain-model command"; "moves entities only, no microflow mode"	rule	kept
"The mxcli team's answer… (2026-09-25)…", --help quote, "Measured: … 10 entity moves"	history / old numbers	moved → MF1
"Before relying on it… probe your binary… no @position, SUB_ split"	rule	kept, unchanged

(learned-microflow-patterns.md has no mxcli layout history, so it is untouched.)

learned-mdl-preflight.md, #879 note (one line; STOP rows untouched)

Text	Class	Disposition
"RESOLVED in v0.21.0, STOP LIFTED (probed 2026-09-10)"	status	kept
"Install no longer shells out… MPR v2 survives"	history	moved → MP1
"opt-in behind --allow-format-change, so the failure can only happen on purpose"	rule	kept
"Measured on a real 501-unit project: …"	old numbers	moved → MP1
"Read the #879 entry before your first install… three new operational traps (…)"	rule / denominator	kept

Field evidence: none yet for the moved text, because this PR changes no behaviour, only where the text sits. The behaviour A/B is owed (below). The field run for check-moved-text.sh is this PR, with 83/83 lines found and a hand-run negative control.

Owed before merge

• Behaviour A/B (required). Use the method in process/preflight-skill-baseline-2026-08-31.md: 5 reps per arm, master skills against this branch's trimmed skills. Run one page task and one microflow task with a loop. Score check-page-shell.sh violations, page-fidelity.js --no-log, the report block with denominators, write mode per operation, the microflow-preflight checklist being posted, and refusal of a seeded STOP operation. Pass if no metric is worse than n=5 noise. Not run in this PR.
• No fixture exists yet for bin/check-moved-text.sh. It was verified by hand with a positive run and a negative control.

Checklist

• No client data in the diff (leak guard clean; whole-word denylist grep of added lines: 0 hits)
• Size cap: 6 files, 354 lines excluding CHANGELOG
• Test tier: T0 + T1 + render-routing --check. test-routing-tier.sh 12 ok / 0 FAIL, test-baseline-pack.sh 16 ok / 0 FAIL, check-skill-routing.sh all pass. No fixture greps the moved text: I checked tests/ for the moved phrases, and the fixtures that name these skills (bug06, bug12, context-audit, context-pack) match on file names only.
• New instrument: no golden capture applies (it reads git diff); bash 3.2-portable (check-portability clean); a fixture is still owed (above)
• CHANGELOG.md line appended, credited
• Also clean: check-scripts.sh (111/111), check-no-private-citations.sh, check-pr-discipline.sh origin/master

Possible conflicts: PR #355 (STOP-table markers in learned-mdl-preflight.md) and the tiers PR (testing-shape.md). This PR changes only the #879 version-note line in learned-mdl-preflight.md, and does not touch testing-shape.md.

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https://claude.ai/code/session_01VJgWP5vEoAsNsJYqCDMGNw

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[MendixMau]

Landed on master in #385 (squash 868b3cb), after its own independent review on the night integration branch. Closing this PR.

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