---
phase: 01-foundation
plan: 02
subsystem: infra
tags: [git, hooks, rerere, zone-taxonomy, rebase, documentation]

# Dependency graph
requires: []
provides:
  - "Zone taxonomy document classifying all rename targets (DISPLAY/CODE/STORED)"
  - "commit-msg git hook enforcing [nexus] prefix on all fork commits"
  - "git rerere enabled with autoupdate for automated conflict re-resolution"
  - "Rebase runbook with range-diff verification workflow"
  - "scripts/nexus-commit-msg-hook.sh tracked for post-clone reinstallation"
affects: [01-foundation, 02-branding, 03-ui-rename, 04-onboarding]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "commit-msg hook: [nexus] prefix on all fork commits for rebase visibility"
    - "git rerere: automated conflict re-resolution across upstream rebases"
    - "Zone taxonomy: DISPLAY/CODE/STORED classification for each occurrence of rename targets"

key-files:
  created:
    - .planning/ZONE-TAXONOMY.md
    - .planning/REBASE-RUNBOOK.md
    - scripts/nexus-commit-msg-hook.sh
    - scripts/install-hooks.sh
  modified: []

key-decisions:
  - "Classify rename targets at occurrence level, not term level — same term can be STORED in one place and DISPLAY in another"
  - "Hook source tracked in scripts/ to survive re-clone; .git/hooks/ is not tracked by git"
  - "rerere.autoupdate=true so resolved conflicts are auto-staged, not just recorded"

patterns-established:
  - "Zone taxonomy: every rename target classified DISPLAY/CODE/STORED before modification"
  - "Fork commit discipline: [nexus] prefix enforced by git hook, merge commits bypass automatically"
  - "Rebase safety: range-diff ORIG_HEAD HEAD after every upstream rebase"

requirements-completed: [FOUND-02, FOUND-03, FOUND-04]

# Metrics
duration: 3min
completed: 2026-03-30
---

# Phase 01 Plan 02: Commit Discipline and Zone Taxonomy Summary

**Zone taxonomy (DISPLAY/CODE/STORED), commit-msg hook enforcing [nexus] prefix, and git rerere established as rebase safety infrastructure before any upstream files are modified**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-30T20:31:13Z
- **Completed:** 2026-03-30T20:34:17Z
- **Tasks:** 2
- **Files modified:** 4

## Accomplishments
- Created `.planning/ZONE-TAXONOMY.md` classifying all rename targets into DISPLAY/CODE/STORED zones at the occurrence level
- Created `.planning/REBASE-RUNBOOK.md` documenting the complete range-diff rebase verification workflow
- Installed commit-msg git hook that rejects non-[nexus]-prefixed commits and bypasses merge commits
- Enabled git rerere with autoupdate for automated conflict re-resolution on future upstream rebases

## Task Commits

Each task was committed atomically:

1. **Task 1: Create zone taxonomy document and rebase runbook** - `3a76d5f9` (docs)
2. **Task 2: Install commit-msg hook and enable git rerere** - `f52e5eda` (chore)
3. **Task 2 deviation: make install-hooks.sh executable** - `260ecbb9` (chore)

## Files Created/Modified
- `.planning/ZONE-TAXONOMY.md` — Zone taxonomy classifying every rename target as DISPLAY/CODE/STORED
- `.planning/REBASE-RUNBOOK.md` — Step-by-step rebase workflow with range-diff verification
- `scripts/nexus-commit-msg-hook.sh` — Tracked source for the commit-msg hook (survives re-clone)
- `scripts/install-hooks.sh` — Post-clone hook reinstallation script

## Decisions Made
- Classify rename targets at occurrence level, not term level: `"ceo"` in `AGENT_ROLES` is STORED (do not touch), while `AGENT_ROLE_LABELS.ceo` value is DISPLAY (safe to change to "Project Manager")
- Hook source tracked in `scripts/nexus-commit-msg-hook.sh` (committed to git) while the active hook lives at `.git/hooks/commit-msg` (not tracked)
- `rerere.autoupdate=true` so resolved conflicts are auto-staged during future rebases, not just recorded

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Committed file permission change for install-hooks.sh**
- **Found during:** Task 2 post-commit check
- **Issue:** `chmod +x scripts/install-hooks.sh` changed file mode from 100644 to 100755; git status showed it as modified after Task 2 commit
- **Fix:** Committed the permission change as a separate atomic commit
- **Files modified:** `scripts/install-hooks.sh` (mode change only)
- **Verification:** `git status --short` clean after commit
- **Committed in:** `260ecbb9`

---

**Total deviations:** 1 auto-fixed (permission mode change)
**Impact on plan:** Trivial housekeeping. No scope creep.

## Issues Encountered
None.

## User Setup Required
None — all git configuration changes apply to the local repository automatically.

## Next Phase Readiness
- Zone taxonomy ready to guide Phase 2 branding package and Phase 3 UI rename work
- commit-msg hook active — all future [nexus] commits will be enforced
- git rerere enabled — conflict re-resolution automated for upstream rebases
- Rebase runbook available at `.planning/REBASE-RUNBOOK.md` for reference when syncing upstream

---
*Phase: 01-foundation*
*Completed: 2026-03-30*

## Self-Check: PASSED

- FOUND: /Volumes/UsbNvme/repos/nexus/.planning/ZONE-TAXONOMY.md
- FOUND: /Volumes/UsbNvme/repos/nexus/.planning/REBASE-RUNBOOK.md
- FOUND: /Volumes/UsbNvme/repos/nexus/scripts/nexus-commit-msg-hook.sh
- FOUND: /Volumes/UsbNvme/repos/nexus/scripts/install-hooks.sh
- FOUND: /Volumes/UsbNvme/repos/nexus/.git/hooks/commit-msg
- FOUND commit: 3a76d5f9
- FOUND commit: f52e5eda
- FOUND commit: 260ecbb9