Revert "Perf playbook: measure, identify, fix, verify with a rerunnable ledger (#549)"

[EdbertChan]

Summary

This removes a speed-work playbook that reached the main branch before it was ready.

The problem: its worked examples were meant to copy real past episodes. Checked one by one, eleven of eighteen had made-up numbers.

The cause: the examples were written to fit the rules. Extra runs and results were invented, so a green check proved nothing.

The fix: undo that merge. The playbook will be rebuilt later, starting from a check against the real episodes.

Review Claim

The playbook, its script, and its worked examples are removed, returning the repository to how it was before that merge.

Review Lane

behavior

Review Unit

product-skill

Safety Invariant

Removes only the five files the merged pull request added, all inside one skill folder; nothing outside that folder refers to the skill, so no other skill, hook, or install step changes.

Slice Rationale

A plain revert of one merge, kept alone so it can land without waiting on the rebuild.

Non-goals

• No rebuild of the playbook in this pull request.
• No change to any other skill, hook, or the landing workers.

Test Plan

Test Plan

git revert 0a2eb69 removes 5 files (310 deletions). No file outside the skill folder names the skill on origin/main (git grep -n measure-then-optimize origin/main outside that folder printed nothing).

unit    product-skill: 5 file(s)
declare Review Unit: product-skill
gate    python3 scripts/check_codify_has_code.py --base origin/main
        ok      codify-has-code
gate    python3 scripts/check_no_dated_provenance.py --base origin/main
        ok      no dated provenance
gate    python3 scripts/check_skills_three_harnesses.py
        ok      skills three-harness check
gate    python3 scripts/check_ecosystem_boundaries.py
        ok      ecosystem boundaries
gate    python3 scripts/check_skill_file_refs.py
        ok      skill file refs
gate    python3 scripts/check_skill_test_coverage.py --base origin/main --head HEAD
        ok      skill test coverage
gate    python3 scripts/check_skill_trigger_mechanism.py
        ok      skill trigger mechanism
gate    python3 scripts/check_skill_trigger_policy.py
        ok	skill trigger policy
gate    python3 scripts/check_subagent_scope_contract.py
        ok	subagent scope contract
gate    python3 scripts/run_skill_scenarios.py
        ok  	subagent-fact-attributed
        ok  	stale-green-caught-without-any-admission
        ok  	stale-green-already-owned-by-the-reply
        ok  	red-then-green-is-a-fix-not-a-stale-claim
        
        ok	all 17 scenario(s) behaved as declared
gate    description_check /private/tmp/claude-501/-Users-edbertchan-Documents-GitHub-catstack/9b25a21a-0b29-4a9a-bcff-548fc74d2eef/scratchpad/pr-revert-549.md
        description clean
ok      preflight passed

Revert Plan

Revert Plan

• Safe to revert? Yes
• Revert command: git revert <merge sha of this PR> (restores the five files)
• Post-revert steps: None
• Data migration? No

🤖 Generated with Claude Code

[cursor]

Bugbot couldn't run - usage limit reached

Bugbot is counted against Cursor usage for this user or team, and this run hit a usage or spend limit.

A user or team admin can review and increase usage limits in the Cursor dashboard.

(requestId: serverGenReqId_d71ec423-8a37-46cb-b08e-be7927118625)

[mergify]

Queued — the merge queue status continues in this comment ↓.

[cursor]

Bugbot couldn't run - usage limit reached

Bugbot is counted against Cursor usage for this user or team, and this run hit a usage or spend limit.

A user or team admin can review and increase usage limits in the Cursor dashboard.

(requestId: serverGenReqId_1e9c9725-b2de-4fb5-9c8d-aaba17aea02f)

[EdbertChan]

@Mergifyio queue

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-09-14 04:18 UTC · Rule: admin-bypass · triggered by @EdbertChan with the @mergifyio queue command
• ✅ Checks passed · on draft merge queue: checking #567 on main (344657b), stacked on #519, #525 and #540 #588
• ✅ Merged — 2026-09-14 04:25 UTC · at 44a545d7bf63029d4c8b0c0627a372b70c6444e5 · squash

This pull request spent 6 minutes 46 seconds in the queue, including 4 minutes 53 seconds running CI.

Required conditions to merge

• check-success = lint
• check-success = test
• check-success = validate