Root cause: PRs #985 and #991 failed CI because:
1. Local clippy doesn't use -D warnings but CI does (caught needless_range_loop)
2. New reductions can create paths that dominate existing direct reductions
   (test_find_dominated_rules_returns_known_set has hardcoded known set)

Added to Step 6:
- Mandatory `cargo clippy -- -D warnings` (not just `cargo clippy`)
- Mandatory `cargo test` (full suite, not filtered)
- Explicit dominated-rules gate with fix instructions

Added to Common Mistakes:
- clippy without -D warnings
- dominated rules test
- skipping full cargo test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: add design spec for proposed reductions Typst note

Covers 9 reductions: 2 NP-hardness chain extensions (#973, #198),
4 Tier 1a blocked issues (#379, #380, #888, #822), and
3 Tier 1b blocked issues (#892, #894, #890).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add verify-reduction skill for mathematical verification of reductions

New skill: /verify-reduction <issue-number>

End-to-end pipeline that takes a reduction rule issue and produces:
1. Typst proof (Construction/Correctness/Extraction/Overhead + YES/NO examples)
2. Python verification script (7 mandatory sections, ≥5000 checks, exhaustive n≤5)
3. Lean 4 lemmas (non-trivial structural proofs required)

Follows issue-to-pr conventions: creates worktree, works in isolation, submits PR.

Strict quality gates (zero tolerance):
- No "trivial" category — every reduction ≥5000 checks
- 7 mandatory Python sections including NO (infeasible) example
- Non-trivial Lean required (rfl/omega tautologies rejected)
- Zero hand-waving in Typst ("clearly", "obviously" → rejected)
- Mandatory gap analysis: every proof claim must have a test
- Self-review checklist with 20+ items across 4 categories

Developed and validated through PR #975 (800K+ checks, 3 bugs caught)
and tested on issues #868 (caught wrong example) and #841 (35K checks).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* style: add YAML frontmatter + professional tone to verify-reduction skill

- Added frontmatter (name, description) matching other skills' convention
- Toned down aggressive language ("ZERO TOLERANCE", "THE HARSHEST STEP",
  "NON-NEGOTIABLE") to professional but firm language
- All quality gates unchanged — same strictness, better presentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: adversarial multi-agent verification in verify-reduction skill

Replaces Lean-required gates with adversarial second agent:

- Step 5: Adversary agent independently implements reduce() and
  extract_solution() from theorem statement only (not constructor's script)
- Step 5c: Cross-comparison of both implementations on 1000 instances
- Lean downgraded from required to optional
- hypothesis property-based testing for n up to 50
- Quality gates: 2 independent scripts ≥5000 checks each + cross-comparison

Design rationale (docs/superpowers/specs/2026-04-01-adversarial-verification-design.md):
- Same agent writing proof + test is the #1 risk for AI verification
- Two independent implementations agreeing > one + trivial Lean
- Lean caught 0 bugs in PR #975; Python caught all 4

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: design spec for verify-reduction skill enhancements

Typst↔Python auto-matching, test vectors JSON for downstream
consumption by add-rule and review-pipeline, adversary tailoring
by reduction type, compositional verification via pred CLI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: implementation plan for verify-reduction enhancements

5 tasks: update verify-reduction (Step 4.5 auto-matching, Step 5 typed
adversary, Step 8 downstream artifacts), create add-reduction skill,
register in CLAUDE.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: enhance verify-reduction with test vectors export, typed adversary, pipeline integration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: create add-reduction skill — consumes verified artifacts from verify-reduction

* feat: register add-reduction skill in CLAUDE.md, update verify-reduction description

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: three improvements to verify-reduction and add-reduction skills

1. verify-reduction Step 1: type compatibility gate — checks source/target
   Value types before proceeding. Stops and comments on issue if types are
   incompatible (e.g., optimization → decision needs K parameter).

2. add-reduction Step 7: mandatory cleanup of verification artifacts from
   docs/paper/verify-reductions/ — Python scripts, JSON, Typst, PDF must
   not get into the library.

3. add-reduction Steps 4/4b/5: mandatory requirements from #974 —
   canonical example in rule_builders.rs (Check 9), example-db lookup
   test (Check 10), paper reduction-rule entry (Check 11).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor: concise verify-reduction (761→124 lines) + self-contained add-reduction

verify-reduction: removed verbose templates, condensed checklists into
prose, kept all requirements but removed boilerplate code blocks that
the agent can derive from context.

add-reduction: integrated add-rule Steps 1-6, write-rule-in-paper
Steps 1-6, and #974 requirements (Checks 9/10/11) into a single
self-contained skill. No need to read 3 other skills.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: restore structural requirements in verify-reduction (124→274 lines)

The previous rewrite over-condensed the skill, removing gates that agents
need to follow: 7-section descriptions with table, minimum check count
table, check count audit template, gap analysis format, common mistakes
table, and self-review checklist with checkboxes.

Restored: all structural gates and requirements.
Kept concise: no verbose Python/Typst code templates (agent derives these).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: harden add-reduction with file-level verification gates

Steps 4, 4b, 5 now have HARD GATE labels with verification commands
that check the SPECIFIC required files appear in `git diff --name-only`.
Step 8 has a pre-commit gate that lists all 6 required files and blocks
commit if any is missing.

Root cause: subagents skipped Steps 4 (put example in rule file instead
of rule_builders.rs) and 5 (skipped paper entry entirely) because the
skill said "MANDATORY" but had no mechanical enforcement.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: add CI-equivalent checks to add-reduction pre-commit gate

Root cause: PRs #985 and #991 failed CI because:
1. Local clippy doesn't use -D warnings but CI does (caught needless_range_loop)
2. New reductions can create paths that dominate existing direct reductions
   (test_find_dominated_rules_returns_known_set has hardcoded known set)

Added to Step 6:
- Mandatory `cargo clippy -- -D warnings` (not just `cargo clippy`)
- Mandatory `cargo test` (full suite, not filtered)
- Explicit dominated-rules gate with fix instructions

Added to Common Mistakes:
- clippy without -D warnings
- dominated rules test
- skipping full cargo test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: correct add-reduction HARD GATE for canonical examples

rule_builders.rs is a 4-line pass-through — canonical examples are
registered via canonical_rule_example_specs() in each rule file,
wired through mod.rs. Updated Step 4 to match actual architecture.

Also added analysis.rs to git add list (for dominated-rules updates).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: parent-side verification + pre-commit hook for add-reduction

Two enforcement mechanisms that don't rely on subagent compliance:

1. Parent-side verification (Step 8a): After subagent reports DONE,
   the parent runs file gate checks independently. If any required
   file is missing, sends the subagent back — doesn't trust self-report.

2. Pre-commit hook (.claude/hooks/add-reduction-precommit.sh):
   Mechanically blocks commits of new rule files unless example_db.rs,
   reductions.typ, and mod.rs are also staged. Subagents cannot bypass.

Root cause: subagents skip HARD GATE steps despite skill text saying
"MANDATORY". Text-based enforcement doesn't work — need mechanical
checks that run after the subagent, not instructions the subagent reads.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: strengthen type compatibility gate in verify-reduction skill

Expanded the type compatibility table to explicitly list all incompatible
pairs (Min→Or, Max→Or, Max→Min, Min→Max, Or→Sum, etc.) with concrete
examples from batch verification (#198 MVC→HamCircuit, #890 MaxCut→OLA).

Added common mistake entry for proceeding past the type gate.

Learned from batch run: 5 out of 50 reductions were mathematically
verified but turned out to be unimplementable as ReduceTo due to
type mismatches that the original gate didn't catch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Delete docs/superpowers/plans/2026-04-01-verify-reduction-enhancements.md

* Delete docs/superpowers/specs/2026-03-31-proposed-reductions-note-design.md

* Delete .claude/CLAUDE.md

* Revert "Delete .claude/CLAUDE.md"

This reverts commit 71c1444.

* chore: remove docs/superpowers/specs/ directory

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor: integrate verify-reduction into add-rule pipeline

- Delete /add-reduction skill and pre-commit hook (absorbed into /add-rule)
- /add-rule now runs /verify-reduction by default; --no-verify to skip
- /verify-reduction simplified: no worktree, no PR, no saved artifacts
- /issue-to-pr passes --no-verify flag through to /add-rule
- Update CLAUDE.md skill descriptions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Jinguo Liu <cacate0129@gmail.com>