docs(03-01): complete library crate and unit tests plan

- SUMMARY.md with 19 unit tests across crypto/compression/format modules
- STATE.md updated to Phase 3 Plan 1/2, 43% progress
- ROADMAP.md marks 03-01-PLAN.md complete
- REQUIREMENTS.md marks TST-03 complete

.planning/REQUIREMENTS.md

@@ -57,7 +57,7 @@
 
 - [ ] **TST-01**: Round-trip тесты: архивация Rust → деархивация Rust
 - [ ] **TST-02**: Golden test vectors: известный plaintext/key/IV → ожидаемый ciphertext
-- [ ] **TST-03**: Базовые unit-тесты для каждого модуля pipeline
+- [x] **TST-03**: Базовые unit-тесты для каждого модуля pipeline
 
 ## v2 Requirements
 
@@ -122,7 +122,7 @@
 | SHL-03 | Phase 5 | Pending |
 | TST-01 | Phase 3 | Pending |
 | TST-02 | Phase 3 | Pending |
-| TST-03 | Phase 3 | Pending |
+| TST-03 | Phase 3 | Complete |
 
 **Coverage:**
 - v1 requirements: 30 total

.planning/ROADMAP.md

@@ -63,7 +63,7 @@ Plans:
 **Plans**: 2 plans
 
 Plans:
-- [ ] 03-01-PLAN.md -- Library crate structure, dev-dependencies, and unit tests for crypto/compression/format modules
+- [x] 03-01-PLAN.md -- Library crate structure, dev-dependencies, and unit tests for crypto/compression/format modules
 - [ ] 03-02-PLAN.md -- Golden test vectors with fixed IV/key and CLI round-trip integration tests
 
 ### Phase 4: Kotlin Decoder
@@ -116,7 +116,7 @@ Phases execute in numeric order: 1 -> 2 -> 3 -> 4 -> 5 -> 6
 |-------|----------------|--------|-----------|
 | 1. Format Specification | 1/1 | Complete    | 2026-02-24 |
 | 2. Core Archiver | 2/2 | Complete    | 2026-02-24 |
-| 3. Round-Trip Verification | 0/2 | Not started | - |
+| 3. Round-Trip Verification | 1/2 | In progress | - |
 | 4. Kotlin Decoder | 0/1 | Not started | - |
 | 5. Shell Decoder | 0/1 | Not started | - |
 | 6. Obfuscation Hardening | 0/1 | Not started | - |

.planning/STATE.md

@@ -5,23 +5,23 @@
 See: .planning/PROJECT.md (updated 2026-02-24)
 
 **Core value:** Archive impossible to unpack without knowing the format -- standard tools (7z, tar, unzip, binwalk) cannot recognize or extract contents
-**Current focus:** Phase 2: Core Archiver
+**Current focus:** Phase 3: Round-Trip Verification
 
 ## Current Position
 
-Phase: 2 of 6 (Core Archiver) -- COMPLETE
-Plan: 2 of 2 in current phase -- COMPLETE
-Status: Phase 2 complete, ready for Phase 3
-Last activity: 2026-02-24 -- Pack/unpack/inspect archive commands
+Phase: 3 of 6 (Round-Trip Verification)
+Plan: 1 of 2 in current phase
+Status: Plan 03-01 complete, ready for Plan 03-02
+Last activity: 2026-02-24 -- Library crate + 19 unit tests for crypto/compression/format
 
-Progress: [███░░░░░░░] 33%
+Progress: [████░░░░░░] 43%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 3
-- Average duration: 4.3 min
-- Total execution time: 0.2 hours
+- Total plans completed: 4
+- Average duration: 4 min
+- Total execution time: 0.3 hours
 
 **By Phase:**
 
@@ -29,10 +29,11 @@ Progress: [███░░░░░░░] 33%
 |-------|-------|-------|----------|
 | 1. Format Specification | 1 | 7 min | 7 min |
 | 2. Core Archiver | 2/2 | 6 min | 3 min |
+| 3. Round-Trip Verification | 1/2 | 3 min | 3 min |
 
 **Recent Trend:**
-- Last 5 plans: 7min, 4min, 2min
-- Trend: improving
+- Last 5 plans: 7min, 4min, 2min, 3min
+- Trend: stable/improving
 
 *Updated after each plan completion*
 
@@ -54,6 +55,9 @@ Recent decisions affecting current work:
 - Phase 2: Filename-only entry names (not full paths) for archive portability
 - Phase 2: HMAC failure skips file and continues; SHA-256 mismatch warns but writes
 - Phase 2: Flags bit 0 set only when at least one file is actually compressed
+- Phase 3: Library crate with pub mod re-exports for all 6 modules
+- Phase 3: Unit tests embedded in modules via #[cfg(test)] (not separate files)
+- Phase 3: hex-literal v1.1 for compile-time SHA-256 known-value assertions
 
 ### Pending Todos
 
@@ -68,5 +72,5 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-02-24
-Stopped at: Completed 02-02-PLAN.md (Pack/unpack/inspect archive commands)
+Stopped at: Completed 03-01-PLAN.md (Library crate + unit tests)
 Resume file: None

.planning/phases/03-round-trip-verification/03-01-SUMMARY.md

@@ -0,0 +1,117 @@
+---
+phase: 03-round-trip-verification
+plan: 01
+subsystem: testing
+tags: [unit-tests, crypto, compression, format, hex-literal, aes-256-cbc, hmac-sha256, sha256, gzip]
+
+# Dependency graph
+requires:
+  - phase: 02-core-archiver
+    provides: "crypto.rs, compression.rs, format.rs modules with full pipeline"
+provides:
+  - "Library crate (src/lib.rs) re-exporting all modules for integration tests"
+  - "19 unit tests covering crypto, compression, and format serialization"
+  - "Dev-dependencies: tempfile, assert_cmd, hex-literal, predicates"
+affects: [03-02, integration-tests, round-trip-verification]
+
+# Tech tracking
+tech-stack:
+  added: [hex-literal 1.1, tempfile 3.26, assert_cmd 2.1, predicates 3.1]
+  patterns: [library-crate-reexports, cfg-test-modules, hex-literal-for-known-values]
+
+key-files:
+  created: [src/lib.rs]
+  modified: [src/main.rs, src/crypto.rs, src/compression.rs, src/format.rs, Cargo.toml]
+
+key-decisions:
+  - "Library crate with pub mod re-exports for all 6 modules (archive, cli, compression, crypto, format, key)"
+  - "hex-literal v1.1 for compile-time hex byte arrays in SHA-256 test assertions"
+  - "Unit tests embedded in modules via #[cfg(test)] mod tests blocks (not separate test files)"
+
+patterns-established:
+  - "Library crate pattern: src/lib.rs re-exports, main.rs uses encrypted_archive:: imports"
+  - "Test pattern: #[cfg(test)] mod tests with use super::* inside each module"
+  - "SHA-256 verification against known values from FORMAT.md worked example"
+
+requirements-completed: [TST-03]
+
+# Metrics
+duration: 3min
+completed: 2026-02-24
+---
+
+# Phase 3 Plan 01: Library Crate and Unit Tests Summary
+
+**Library crate structure with 19 unit tests covering AES-256-CBC encrypt/decrypt, HMAC-SHA256, SHA-256, gzip compression, and format serialization round-trips**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-02-24T21:28:18Z
+- **Completed:** 2026-02-24T21:31:08Z
+- **Tasks:** 2
+- **Files modified:** 6
+
+## Accomplishments
+- Created library crate (src/lib.rs) enabling integration tests in tests/ directory for Plan 02
+- Added 19 unit tests across 3 modules all passing: crypto (6), compression (6), format (7)
+- Verified SHA-256 known values match FORMAT.md Section 12.3 worked example
+- Verified TOC entry size calculation matches FORMAT.md worked example (110 + 109 = 219 bytes)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create lib.rs, update main.rs imports, add dev-dependencies** - `ce9012c` (feat)
+2. **Task 2: Add unit tests to crypto.rs, compression.rs, and format.rs** - `3e96b1e` (test)
+
+## Files Created/Modified
+- `src/lib.rs` - Library crate re-exporting all 6 modules as public
+- `src/main.rs` - Updated to use `encrypted_archive::` imports instead of local mod declarations
+- `Cargo.toml` - Added dev-dependencies (tempfile, assert_cmd, hex-literal, predicates)
+- `src/crypto.rs` - 6 unit tests: encrypt/decrypt roundtrip, empty data, size formula, HMAC, SHA-256 known values
+- `src/compression.rs` - 6 unit tests: compress/decompress roundtrip, empty/large data, should_compress heuristic
+- `src/format.rs` - 7 unit tests: header roundtrip, TOC entry roundtrip (ASCII/Cyrillic/empty name), bad magic/version rejection, entry size calculation
+
+## Decisions Made
+- Used hex-literal v1.1 (latest) for compile-time hex byte arrays in SHA-256 assertions
+- Embedded tests in modules via #[cfg(test)] rather than separate test files (keeps tests close to implementation)
+- Library crate re-exports all 6 modules (archive, cli, compression, crypto, format, key) for maximum flexibility
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Updated hex-literal version from 0.4 to 1.1**
+- **Found during:** Task 2 (adding unit tests)
+- **Issue:** Plan specified hex-literal 1.1 but initial Cargo.toml had 0.4; cargo resolved to 0.4.1 which is outdated
+- **Fix:** Updated Cargo.toml to hex-literal = "1.1" (latest stable)
+- **Files modified:** Cargo.toml
+- **Verification:** cargo build + cargo test pass
+- **Committed in:** 3e96b1e (Task 2 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** Minor version correction, no scope change.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Library crate ready for integration tests in tests/ directory (Plan 02)
+- All pipeline modules have unit test coverage proving correctness
+- Dev-dependencies (tempfile, assert_cmd, predicates) ready for CLI round-trip tests
+
+## Self-Check: PASSED
+
+- All 6 key files exist on disk
+- Both task commits verified: ce9012c, 3e96b1e
+- cargo test: 19 passed, 0 failed
+
+---
+*Phase: 03-round-trip-verification*
+*Completed: 2026-02-24*