fix(01): correct depends_on format to use plan number

Change depends_on from [01-02] to ["02"] for consistency
with plan frontmatter format.

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

.planning/phases/01-foundation/01-01-PLAN.md

@@ -3,7 +3,7 @@ phase: 01-foundation
 plan: 01
 type: tdd
 wave: 2
-depends_on: [01-02]
+depends_on: ["02"]
 files_modified: [kb_pipeline/state.py, tests/test_pipeline/test_state.py]
 autonomous: true
 requirements: [PIPE-02, REL-01, REL-03]

.planning/phases/01-foundation/01-03-PLAN.md

@@ -3,7 +3,7 @@ phase: 01-foundation
 plan: 03
 type: tdd
 wave: 2
-depends_on: [01-02]
+depends_on: ["02"]
 files_modified: [kb_pipeline/errors.py, kb_pipeline/config.py, kb_pipeline/retry.py, tests/test_pipeline/test_errors.py, tests/test_pipeline/test_config.py, tests/test_pipeline/test_retry.py]
 autonomous: true
 requirements: [REL-02, MNT-02, MNT-03]