docs(08-01): complete Rust directory archiver plan

- Create 08-01-SUMMARY.md with execution results and metrics
- Update STATE.md: Phase 8 complete, 12/~19 plans (63%)
- Update ROADMAP.md: Phase 8 marked complete
- Update REQUIREMENTS.md: DIR-01 through DIR-05 marked complete

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/phases/08-rust-directory-archiver/08-01-SUMMARY.md

@@ -0,0 +1,119 @@
+---
+phase: 08-rust-directory-archiver
+plan: 01
+subsystem: archive
+tags: [rust, directory-traversal, unix-permissions, binary-format, toc-entry]
+
+# Dependency graph
+requires:
+  - phase: 07-format-spec-update
+    provides: v1.1 FORMAT.md with entry_type, permissions fields, directory entry semantics
+provides:
+  - v1.1 TocEntry with entry_type and permissions fields (format.rs)
+  - Recursive directory traversal in pack with relative paths
+  - Directory hierarchy restoration with Unix mode bits in unpack
+  - Entry type and permissions display in inspect
+  - Directory round-trip integration tests
+affects: [09-backward-compat, 10-hardening, 11-polish]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [collect_entries pattern for recursive directory traversal, DFS preorder for parent-before-child ordering, ProcessedFile entry_type discriminator for file vs directory handling]
+
+key-files:
+  created: []
+  modified:
+    - src/format.rs
+    - src/archive.rs
+    - src/cli.rs
+    - tests/round_trip.rs
+
+key-decisions:
+  - "DFS preorder traversal with sorted children for deterministic parent-before-child ordering"
+  - "Directory entries use zero-filled crypto fields (no data block) per FORMAT.md v1.1"
+  - "Permissions captured via std::os::unix::fs::PermissionsExt::mode() & 0o7777"
+  - "Standalone files use filename-only names; directory children use relative paths with / separator"
+
+patterns-established:
+  - "collect_entries(): unified entry collection for mixed file/directory inputs"
+  - "process_file(): extracted crypto pipeline into reusable function"
+  - "make_directory_entry(): factory for zero-length directory ProcessedFile"
+
+requirements-completed: [DIR-01, DIR-02, DIR-03, DIR-04, DIR-05]
+
+# Metrics
+duration: 6min
+completed: 2026-02-26
+---
+
+# Phase 8 Plan 01: Rust Directory Archiver Summary
+
+**v1.1 format implementation with recursive directory traversal, Unix permission preservation, and directory/file type discrimination in pack/unpack/inspect**
+
+## Performance
+
+- **Duration:** 6 min
+- **Started:** 2026-02-26T18:42:02Z
+- **Completed:** 2026-02-26T18:48:33Z
+- **Tasks:** 3
+- **Files modified:** 4
+
+## Accomplishments
+- Updated format.rs to v1.1 binary layout: VERSION=2, TocEntry with entry_type (u8) and permissions (u16), entry_size=104+name_length
+- Implemented recursive directory traversal in pack() with parent-before-child ordering and relative path naming
+- unpack() creates full directory hierarchy, restores Unix mode bits on both files and directories
+- inspect() displays entry type (dir/file) and octal permissions for each TOC entry
+- All 41 tests pass: 25 unit + 7 golden + 9 integration (3 new directory tests)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Update format.rs for v1.1 TOC entry layout** - `4e25d19` (feat)
+2. **Task 2: Update archive.rs and cli.rs for directory support** - `7820c18` (feat)
+3. **Task 3: Add directory round-trip integration test** - `8760981` (test)
+
+## Files Created/Modified
+- `src/format.rs` - v1.1 TocEntry with entry_type/permissions, VERSION=2, entry_size=104+N
+- `src/archive.rs` - Recursive directory traversal, permission capture/restore, directory-aware pack/unpack/inspect
+- `src/cli.rs` - Updated doc comments for directory support
+- `tests/round_trip.rs` - 3 new tests: directory round-trip, mixed files+dirs, inspect directory info
+
+## Decisions Made
+- Used DFS preorder with sorted children for deterministic parent-before-child ordering (no external walkdir dependency)
+- Extracted crypto pipeline into process_file() helper for reuse between single-file and directory-file processing
+- Directory entries skip data_offset computation and data block writing (offset=0, no ciphertext)
+- Permissions always stored as lower 12 bits of mode_t (0o7777 mask) per FORMAT.md v1.1 spec
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Added entry_type/permissions to archive.rs ProcessedFile during Task 1**
+- **Found during:** Task 1 (format.rs update)
+- **Issue:** After adding new fields to TocEntry, archive.rs TocEntry constructions failed to compile
+- **Fix:** Added entry_type and permissions fields to ProcessedFile struct and its construction in pack()
+- **Files modified:** src/archive.rs
+- **Verification:** cargo test --lib format:: passed all 13 tests
+- **Committed in:** 4e25d19 (Task 1 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** Necessary compilation fix from cross-file dependency. No scope creep.
+
+## Issues Encountered
+None -- all tasks executed smoothly after the blocking compilation fix.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- v1.1 format fully implemented and tested
+- Ready for Phase 9 (backward compatibility) or Phase 10 (hardening) if planned
+- All existing v1.0 tests updated to v1.1 format (no backward compat with v1.0 archives per decision)
+
+---
+*Phase: 08-rust-directory-archiver*
+*Completed: 2026-02-26*