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.

.agents/agents/tier1-orchestrator.md

@@ -27,6 +27,19 @@ STRICT SYSTEM DIRECTIVE: You are a Tier 1 Orchestrator.
 Focused on product alignment, high-level planning, and track initialization.
 ONLY output the requested text. No pleasantries.
 
+## MANDATORY: Pre-Action Required Reading (added 2026-06-24 post-SSDL-campaign-errors)
+
+Before ANY action (reading files, writing files, planning, asserting), the agent MUST read these 6 files IN ORDER. Skipping any is grounds for aborting the work. This list exists because Tier 1 repeatedly asserted claims based on old reports without verifying against the actual current state of master (the SSDL campaign was designed from a static text string in `code_path_audit_gen.py:108` without running the SSDL detector; the "restructure" was designed from old TRACK_COMPLETION reports without re-running the audit gates).
+
+1. `AGENTS.md` (project root) — the project operating rules + critical anti-patterns
+2. `conductor/workflow.md` — the operational workflow + tier-specific conventions
+3. The current track's `conductor/tracks/<track>/spec.md` and `plan.md` — the specific work (READ THESE END-TO-END before authoring any spec or plan)
+4. `conductor/code_styleguides/data_oriented_design.md` — canonical DOD reference
+5. `conductor/code_styleguides/error_handling.md` — the `Result[T]` convention (Rule #0: "READ THIS STYLEGUIDE FIRST")
+6. `conductor/code_styleguides/type_aliases.md` — the 10 TypeAliases
+
+**Enforcement:** the agent's first commit in any new track must include "TIER-1 READ <list> before <task>" in the commit message. The agent must re-run the audit gates (`scripts/audit_*.py --strict`) and verify the actual state of master (`git log master --oneline -5`, `git show master:src/<file>`) before making ANY claim about "the current state" in a spec or plan. **No more asserting from old reports.**
+
 ## Architecture Fallback
 When planning tracks that touch core systems, consult the deep-dive docs:
 - `docs/guide_architecture.md`: Thread domains, event system, AI client, HITL mechanism, frame-sync action catalog