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Stress Test Results: Fast-Forward-Only Integration

Structural Invalid States (Now Unreachable)

Path Scenario Prevention
1 Lock Race Simultaneous integration Git push atomicity
2 Zombie Lock Crash mid-operation No locks used
3 Partial Integration Half-updated state Single atomic commit
6 Concurrent Claim Double assignment First-wins semantics

Verdict: ✅ All unreachable via FF-only design

Remaining Reachable Invalid States

Path 5: False Confirmation

Scenario: Worker commits "complete: BX1.1" but actually implemented BX1.2

Why reachable: Git only verifies commit message syntax, not semantic truth

Mitigation options:

  1. Content-addressed verification (hash of work vs expected)
  2. Human review gate
  3. Automated test verification (tests pass = claim valid)

Current verdict: ❌ Reachable

Path 7: Orphaned Branch → Rebase Corruption

Scenario:

  • Worker branches from main@T0
  • Main advances significantly
  • FF merge fails
  • Rebase conflicts
  • Worker resolves incorrectly

Why reachable: Rebase requires human judgment for conflicts

Mitigation options:

  1. Rebase prohibition (reject if not FF, force redo)
  2. Time-bounded integration window
  3. Automated conflict resolution (impossible in general)

Current verdict: ❌ Reachable

Path 8: Untracked Integration

Scenario: Worker integrates commit without checkbox reference

Why reachable: No enforcement of commit message format during merge

Mitigation:

  1. Commit message linting in integrate.sh
  2. Reject commits not matching "complete: CHECKBOX"

Current verdict: ❌ Reachable

Path 9: Network Partition → Retry Conflict

Scenario:

  • Local FF merge succeeds
  • Push fails (timeout)
  • Retry: main moved
  • Rebase required

Same as Path 7: Rebase corruption risk

Current verdict: ❌ Reachable

The Fundamental Tension

FF-Only Design          Reality
─────────────────       ─────────────────
No locks needed    ←→   Conflicts happen
Atomic operations  ←→   Network partitions
No rebase needed   ←→   Concurrent work
Unreachable states ←→   Humans resolve conflicts

The choice:

  1. Accept rebase risk: Build strong verification (tests, review)
  2. Reject rebase: Throw away work to preserve invariants

Recommended Hardening

To make remaining paths unreachable:

# integrate.sh hardened

# 1. Commit message enforcement (Path 8)
git log --format=%s HEAD^..HEAD | grep -E "^complete: [A-Z]+[0-9]+\.[0-9]+$" || exit 1

# 2. Recency check (Path 7, 9)
BRANCH_BASE=$(git merge-base HEAD origin/main)
MAIN_TIP=$(git rev-parse origin/main)
if [ "$BRANCH_BASE" != "$MAIN_TIP" ]; then
    echo "ERROR: Branch too old. Abandon and redo work."
    exit 1
fi

# 3. Pre-merge validation (Path 4)
./control-plane/check_gates.sh || exit 1

# 4. FF-only merge
git merge --ff-only "$WORKER_BRANCH" || exit 1

# 5. Push (atomic)
git push origin main

Result: If any check fails, integration aborts. No manual resolution allowed.

Trade-off Summary

Approach Invalid States Lost Work Complexity
v1 (59 scripts) Prevented (mostly) Low Very High
v2 simple (6 scripts) Reachable Medium Low
FF-only + recency Unreachable High (rejected work) Medium
FF-only + rebase Reachable (conflict resolution) Low Medium

Recommendation: FF-only + recency check for invariant-critical paths; accept rebase risk for velocity paths.