---
phase: 01-config-and-command-foundation
plan: "01"
subsystem: config
tags: [config, resolver, path-inventory, paperforge-lite, stdlib]

# Dependency graph
requires: []
provides:
  - Shared config resolver paperforge.config with locked precedence
  - 13-key path inventory for all Phase 1+ consumers
  - Environment variable override contract (CONF-01)
  - Backward-compatible paperforge.json parsing (CONF-04)
affects: [01-02, 01-03, 01-04, worker, ld-deep]

# Tech tracking
tech-stack:
  added: [pathlib, json, os.environ (read-only)]
  patterns: [D-Configuration Hierarchy, layered merge, path inventory contract]

key-files:
  created:
    - paperforge/__init__.py
    - paperforge/config.py
    - tests/test_config.py
  modified: []

key-decisions:
  - "Config precedence: overrides > env > JSON nested > JSON top-level > defaults (locked D-Configuration Hierarchy)"
  - "paperforge_paths returns exactly 13 keys: vault, system, paperforge, exports, ocr, resources, literature, control, library_records, bases, worker_script, skill_dir, ld_deep_script"
  - "No command_dir in path inventory (not a user-facing diagnostic path)"
  - "resolve_vault walks cwd upward for paperforge.json, enabling --vault-free invocation"
  - "No os.environ mutation; env is a read-only dict parameter"

patterns-established:
  - "Pattern: stdlib-only resolver with layered merge from defaults → JSON → env → overrides"
  - "Pattern: paperforge_paths returns absolute Path objects; paths_as_strings converts to strings at output boundary"
  - "Pattern: resolve_vault with upward cwd search for paperforge.json enables vault inference without explicit --vault"

requirements-completed: [CONF-01, CONF-02, CONF-03, CONF-04]

# Metrics
duration: 8min
completed: 2026-04-23
---

# Phase 1 Plan 1: Config And Command Foundation Summary

**Shared config resolver with locked precedence, 13-key path inventory, and full test coverage for CONF-01 through CONF-04**

## Performance

- **Duration:** 8 min
- **Started:** 2026-04-23T03:33:07Z
- **Completed:** 2026-04-23T03:41:29Z
- **Tasks:** 2 (TDD RED + GREEN)
- **Files modified:** 3 created

## Accomplishments

- `paperforge/config.py` with `DEFAULT_CONFIG`, `ENV_KEYS`, `CONFIG_KEYS`, `read_paperforge_json`, `resolve_vault`, `load_vault_config`, `paperforge_paths`, `paths_as_strings`
- 22 passing pytest tests proving precedence, backward compatibility, and path inventory
- No external dependencies beyond stdlib (json, os, pathlib)
- No os.environ mutation; env is a read-only parameter

## Task Commits

Each task was committed atomically:

1. **Task 1 RED: test(01-01): add failing test for config resolver contract** - `6b0b16b` (test)
   - 22 tests covering defaults, env overrides, JSON precedence, path keys, resolve_vault

2. **Task 2 GREEN: feat(01-01): implement shared config resolver** - `a6c0cb0` (feat)
   - DEFAULT_CONFIG, ENV_KEYS, resolve_vault, load_vault_config, paperforge_paths, paths_as_strings

**Plan metadata:** (none — no doc-only commit in this parallel execution)

## Files Created/Modified

- `paperforge/__init__.py` - Package init with re-exports
- `paperforge/config.py` - Core resolver: 273 lines, stdlib only
- `tests/test_config.py` - 22 passing tests covering all contract requirements

## Decisions Made

- Config precedence order locked as: overrides > env > JSON nested > JSON top-level > defaults
- `paperforge_paths` returns exactly 13 keys; `command_dir` intentionally excluded (not a user-facing diagnostic path)
- `resolve_vault` walks current directory upward to find `paperforge.json`, enabling vault-free CLI invocation
- `load_vault_config` accepts optional `env` dict parameter to avoid mutating global `os.environ`

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- `paperforge.config` is importable and tested; ready for Plan 01-02 (CLI entry point)
- Worker (`literature_pipeline.py`) and `/LD-deep` (`ld_deep.py`) can now be updated to import from `paperforge.config` instead of duplicating resolver logic
- Requirements CONF-01 through CONF-04 are satisfied; traceability established

---
*Phase: 01-config-and-command-foundation*
*Completed: 2026-04-23*
