conductor(tier-setup): MANDATORY pre-action reading + pre-commit abort on leak

ROOT CAUSE (post-mortem at docs/reports/TIER2_MCP_REGRESSION_20260624.md):
- Tier 1 asserted claims from old reports without re-verifying (SSDL campaign
  was designed from a static text string '6 nil-check functions' in
  src/code_path_audit_gen.py:108 that was never a runtime measurement)
- Tier 2 (autonomous) made an empty fix commit (2b7e2de1) for the MCP
  regression; the pre-commit hook silently stripped opencode.json +
  mcp_paths.toml and the agent reported success without verifying with
  'git show HEAD --stat'
- Both happened because neither tier read the critical files before acting

THE FIX (this commit):

1. .agents/agents/tier1-orchestrator.md: add MANDATORY pre-action reading
   list (6 files: AGENTS.md, conductor/workflow.md, current track spec/plan,
   the 3 code_styleguides). Reference the 2026-06-24 SSDL failures.

2. .agents/agents/tier2-tech-lead.md: add MANDATORY pre-action reading list
   (8 files: AGENTS.md, workflow.md, edit_workflow.md, the githooks
   forbidden-files.txt, the tier2_leak_prevention spec, the 3 styleguides)
   + the MANDATORY pre-commit verification gate (3 checks per commit).

3. .agents/agents/tier3-worker.md: add 4-file read list (AGENTS.md, task
   spec, relevant styleguide, the actual code being modified). Tier 3 doesn't
   need the full 8-file list — Tier 2's task spec is the contract.

4. .agents/agents/tier4-qa.md: same 4-file read list (analysis context).

5. conductor/tier2/agents/tier2-autonomous.md: add the 8-file MANDATORY
   pre-action reading list + the MANDATORY pre-commit verification gate.

6. conductor/tier2/commands/tier-2-auto-execute.md: add the 8-file list
   to the pre-flight section (step 0).

7. conductor/tier2/githooks/pre-commit: change behavior from 'silent strip
   + commit anyway' to 'strip + ABORT commit with diagnostic message'.
   The previous behavior led to empty commits (the 2026-06-24 regression).
   The agent MUST investigate the leak before retrying the commit.

ENFORCEMENT (all tiers):
- First commit of any track must include 'TIER-N READ <list> before <task>'
  in the commit message. The failcount contract treats an unacknowledged
  first commit as a red-phase failure (per the error_handling.md Rule #0
  precedent).

NOT IN THIS COMMIT (deferred to followup tracks per the post-mortem):
- Rule 4 (CI gate for required files via scripts/audit_branch_required_files.py)
- AGENTS.md addition of the canonical 'MANDATORY Pre-Action Reading' section
  (separate track to ensure the project-root rules reflect the same list)
- Cross-platform agent files (.opencode/, .claude/, .gemini/) — those are
  generated from the canonical .agents/agents/ files; this commit updates
  the canonical sources.

7 files modified, 109 insertions, 6 deletions.

conductor/tier2/commands/tier-2-auto-execute.md

@@ -14,6 +14,18 @@ Optional flags: `--resume` (continue from last completed task), `--toast` (Windo
 
 ## Pre-flight
 
+0. **MANDATORY: Read these 8 files IN ORDER before any other action** (added 2026-06-24 post-MCP-regression):
+   1. `AGENTS.md` (project root) — operating rules
+   1. `conductor/workflow.md` — workflow + tier conventions
+   1. `conductor/edit_workflow.md` — edit tool contract
+   1. `conductor/tier2/githooks/forbidden-files.txt` — file denylist
+   1. `conductor/tracks/tier2_leak_prevention_20260620/spec.md` — prior leak incident (DO NOT REPEAT)
+   1. `conductor/code_styleguides/data_oriented_design.md` — canonical DOD
+   1. `conductor/code_styleguides/error_handling.md` — `Result[T]` convention
+   1. `conductor/code_styleguides/type_aliases.md` — the 10 TypeAliases
+
+   The first commit of the track must include "TIER-2 READ <list> before <task>" in the commit message. The failcount contract treats an unacknowledged first commit as a red-phase failure.
+
 1. **Verify sandbox is active.** This slash command must be invoked from a sandboxed OpenCode session. If `manual-slop_get_ui_performance` returns an error or the run_tier2_sandboxed.ps1 wrapper is not in the parent process, refuse to start.
 2. **Load the track spec.** Read `conductor/tracks/<track-name>/spec.md` and `plan.md` from the current branch. If the track does not exist, abort.
 3. **Check for a previous run.** If `tests/artifacts/tier2_state/<track-name>/state.json` exists AND `--resume` is NOT set, abort with: "Previous run found for this track. Use `--resume` to continue, or delete the state file to start fresh."