docs: contract batch from the 2026-09-10 merge train — catalog 46-48, test screen 13, fixer rules, merge-train rows (refs #2800)

[apmantza]

Summary

Contract batch from today's merge train, docs and playbooks only (no code).

• AGENTS.md: catalog shapes 46 (parser fed by a double whose shape the tool never emits, fix(diagnostics): project-runner authority is per-file coverage, not per-runner-id (refs #2887) #2900 r4 madge / fix(installer): handle PEP 668 pip tools (closes #2916) #2921 r1 ambient PATH), 47 (a detector whose corpus includes its own fixtures, ci(pr-body): citations are verified against the head tree; template and fixer contract aligned (refs #2904) #2913 r3), 48 (check-then-act on a shared durable directory, fix(config): project data-dir slug carries a path hash so separator/hyphen twins get distinct directories (closes #2874) #2929 r1); test screen 13 (a detector pinned only in the accept direction, test(config): vi-mock export sweep reads importOriginal<T>() as a pass-through (closes #2881) #2930 r1).
• docs/pi-lens-fixer.md (daemon copy synced): authority words are claims (fix(dispatch): detectFileRole recognises Go _test.go and the other table conventions (closes #2880) #2925); facts about master from a fetched origin/master (test(docs): membership guard for feature lists (closes #2919) #2924); never assert CI (fix(config): project data-dir slug carries a path hash so separator/hyphen twins get distinct directories (closes #2874) #2929, fix(hooks): per-hook wall budgets, bounded awaits and off-hook remainder delivery (refs #2523) #2897 r2); a detector test has two directions (test(config): vi-mock export sweep reads importOriginal<T>() as a pass-through (closes #2881) #2930); tool output is a fixture, not a guess (fix(diagnostics): project-runner authority is per-file coverage, not per-runner-id (refs #2887) #2900).
• .claude/skills/merge-train/SKILL.md: five orchestrator mistake rows (design question left to the fixer; guessed branch names; the ignored-path exclude in git add; ci-verdict exit 70 during API outages; a registry-membership guard changing other lanes' requirements).

Blast radius

Docs and playbooks only: AGENTS.md, docs/pi-lens-fixer.md, .claude/skills/merge-train/SKILL.md, one changelog fragment. No runtime, test or script file changes; no consumer of these files is code.

Class sweep

Each added rule names the lane that produced it (issue refs inline); the daemon copy of the fixer contract at ~/.plegma/contracts/pi-lens-fixer.md is synced by hand and is not in this repo.

Verification

Docs-only: markdownlint and the changelog fragment check run in CI; tests/config covers the fragment format. No test id table (no tests changed).

Observability

No new failure path; no record added.

Checklist

• Changelog fragment in .changelog/
• Docs-only (Tier C: orchestrator read + CI on the exact head)

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud