docs(09-01): complete Kotlin decoder update plan

- Summary: v1.1 Kotlin decoder with directory support and permission restoration
- STATE.md: Phase 9 complete, 13 plans total
- ROADMAP.md: Phase 09 progress updated
- REQUIREMENTS.md: KOT-05, KOT-06, KOT-07 marked complete

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

.planning/REQUIREMENTS.md

@@ -78,9 +78,9 @@
 
 ### Kotlin Decoder
 
-- [ ] **KOT-05**: Парсинг нового TOC с типом записи и permissions
+- [x] **KOT-05**: Парсинг нового TOC с типом записи и permissions
-- [ ] **KOT-06**: Создание иерархии директорий при извлечении
+- [x] **KOT-06**: Создание иерархии директорий при извлечении
-- [ ] **KOT-07**: Установка permissions (File.setReadable/setWritable/setExecutable)
+- [x] **KOT-07**: Установка permissions (File.setReadable/setWritable/setExecutable)
 
 ### Shell Decoder
 
@@ -170,9 +170,9 @@
 | DIR-03 | Phase 8 | Complete |
 | DIR-04 | Phase 8 | Complete |
 | DIR-05 | Phase 8 | Complete |
-| KOT-05 | Phase 9 | Pending |
+| KOT-05 | Phase 9 | Complete |
-| KOT-06 | Phase 9 | Pending |
+| KOT-06 | Phase 9 | Complete |
-| KOT-07 | Phase 9 | Pending |
+| KOT-07 | Phase 9 | Complete |
 | SHL-04 | Phase 10 | Pending |
 | SHL-05 | Phase 10 | Pending |
 | SHL-06 | Phase 10 | Pending |

.planning/STATE.md

@@ -2,13 +2,13 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: Directory Support
-status: unknown
+status: in-progress
-last_updated: "2026-02-26T18:54:07.801Z"
+last_updated: "2026-02-26T19:05:44Z"
 progress:
-  total_phases: 8
+  total_phases: 9
-  completed_phases: 8
+  completed_phases: 9
-  total_plans: 12
+  total_plans: 13
-  completed_plans: 12
+  completed_plans: 13
 ---
 
 # Project State
@@ -18,28 +18,29 @@ progress:
 See: .planning/PROJECT.md (updated 2026-02-25)
 
 **Core value:** Archive impossible to unpack without knowing the format -- standard tools (7z, tar, unzip, binwalk) cannot recognize or extract contents
-**Current focus:** Milestone v1.1 Directory Support -- Phase 8: Rust Directory Archiver COMPLETE
+**Current focus:** Milestone v1.1 Directory Support -- Phase 9: Kotlin Decoder Update COMPLETE
 
 ## Current Position
 
-Phase: 8 of 11 (Rust Directory Archiver) -- COMPLETE
+Phase: 9 of 11 (Kotlin Decoder Update) -- COMPLETE
 Plan: 1 of 1 -- COMPLETE
-Status: Phase 8 complete, v1.1 directory support implemented and tested
+Status: Phase 9 complete, Kotlin decoder updated for v1.1 format with directory support
-Last activity: 2026-02-26 -- Phase 8 Plan 01 executed (directory archival in Rust)
+Last activity: 2026-02-26 -- Phase 9 Plan 01 executed (Kotlin decoder v1.1 update)
 
-Progress: [############........] 63% (12/~19 plans estimated)
+Progress: [#############.......] 68% (13/~19 plans estimated)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 12
+- Total plans completed: 13
-- Average duration: 3.8 min
+- Average duration: 3.6 min
 - Total execution time: 0.8 hours
 
 | Phase | Plan | Duration | Tasks | Files |
 |-------|------|----------|-------|-------|
 | 07-01 | Format Spec Update | 8 min | 2 | 1 |
 | 08-01 | Rust Directory Archiver | 6 min | 3 | 4 |
+| 09-01 | Kotlin Decoder Update | 2 min | 2 | 2 |
 
 ## Accumulated Context
 
@@ -62,6 +63,9 @@ Recent decisions affecting current work:
 - v1.1: Extracted crypto pipeline into process_file() helper for reuse
 - v1.1: Directory entries skip data_offset computation (offset=0, no ciphertext)
 - v1.1: Permissions stored as lower 12 bits of mode_t (0o7777 mask)
+- v1.1: Kotlin decoder uses Java File API owner/everyone permission model (no group-level granularity)
+- v1.1: Directory entries in Kotlin decoder skip crypto pipeline entirely, use mkdirs()
+- v1.1: Permission application order: everyone flags first, then owner-only overrides
 
 ### Pending Todos
 
@@ -74,5 +78,5 @@ None.
 ## Session Continuity
 
 Last session: 2026-02-26
-Stopped at: Completed 08-01-PLAN.md -- Phase 8 complete, v1.1 directory support implemented
+Stopped at: Completed 09-01-PLAN.md -- Phase 9 complete, Kotlin decoder updated for v1.1
 Resume file: None

.planning/phases/09-kotlin-decoder-update/09-01-SUMMARY.md

@@ -0,0 +1,104 @@
+---
+phase: 09-kotlin-decoder-update
+plan: 01
+subsystem: decoder
+tags: [kotlin, android, directory-support, binary-format, permissions, cross-validation]
+
+# Dependency graph
+requires:
+  - phase: 08-rust-directory-archiver
+    provides: v1.1 Rust archiver with directory traversal, entry_type/permissions in TOC
+provides:
+  - v1.1-compatible Kotlin decoder with directory support and permission restoration
+  - Cross-validation test script with 8 test cases (5 original + 3 directory)
+affects: [10-hardening, 11-polish]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [applyPermissions pattern using Java File API owner/everyone distinction, directory-first extraction with parent directory creation]
+
+key-files:
+  created: []
+  modified:
+    - kotlin/ArchiveDecoder.kt
+    - kotlin/test_decoder.sh
+
+key-decisions:
+  - "Java File API owner/everyone permission model sufficient for KOT-07 (no group-level granularity)"
+  - "Directory entries processed before file entries naturally via DFS preorder parent-before-child ordering"
+  - "Permission application: set everyone flags first (ownerOnly=false), then override owner-only (ownerOnly=true)"
+
+patterns-established:
+  - "applyPermissions(): extract POSIX mode bits and map to Java File setReadable/setWritable/setExecutable"
+  - "Entry type dispatch: directory entries skip crypto pipeline entirely, file entries ensure parent dirs exist"
+
+requirements-completed: [KOT-05, KOT-06, KOT-07]
+
+# Metrics
+duration: 2min
+completed: 2026-02-26
+---
+
+# Phase 9 Plan 01: Kotlin Decoder Update Summary
+
+**v1.1 Kotlin decoder with directory hierarchy creation, empty directory support, and POSIX permission restoration via Java File API**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-02-26T19:03:18Z
+- **Completed:** 2026-02-26T19:05:44Z
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+- Updated TocEntry data class with entryType (0=file, 1=directory) and permissions (12-bit POSIX mode_t) fields
+- Kotlin decoder now parses v1.1 TOC entries (104 + name_length bytes) with entry_type and permissions
+- Directory entries create full hierarchy via mkdirs() without attempting decryption
+- File entries with relative paths create parent directories before writing
+- Permissions restored via Java File API (setReadable/setWritable/setExecutable with owner/everyone distinction)
+- Test script expanded from 5 to 8 test cases with nested directory, empty directory, and mixed file/directory tests
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Update ArchiveDecoder.kt for v1.1 format with directory support** - `a01b260` (feat)
+2. **Task 2: Update test_decoder.sh with directory test cases** - `27fb392` (test)
+
+## Files Created/Modified
+- `kotlin/ArchiveDecoder.kt` - v1.1 decoder: entryType/permissions parsing, directory handling, permission restoration
+- `kotlin/test_decoder.sh` - 3 new directory test cases (nested dirs, empty dir, mixed files+dirs)
+
+## Decisions Made
+- Used Java File API owner/everyone permission model (no Java NIO PosixFilePermission) per KOT-07 spec
+- Permission application order: set everyone flags first (ownerOnly=false), then owner-only overrides (ownerOnly=true) to correctly handle cases where owner has permissions but others do not
+- Entry size formula updated from 101 to 104 + name_length consistently
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None - all tasks completed without issues.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Kotlin decoder fully compatible with v1.1 format produced by Rust archiver
+- Cross-validation test script ready with 8 test cases covering files, directories, empty dirs, and mixed content
+- Ready for Phase 10 (hardening) or Phase 11 (polish)
+
+## Self-Check: PASSED
+
+- [x] kotlin/ArchiveDecoder.kt exists
+- [x] kotlin/test_decoder.sh exists
+- [x] 09-01-SUMMARY.md exists
+- [x] Commit a01b260 (Task 1) verified
+- [x] Commit 27fb392 (Task 2) verified
+
+---
+*Phase: 09-kotlin-decoder-update*
+*Completed: 2026-02-26*