feat(task-021): add context health reporting

TASKS.md

@@ -431,6 +431,7 @@ Added `rdb generate` CLI command (accepts `--min-confidence` option).
 Fixed a parsing bug in `discovery.py`: escaped pipe characters (`\|`) in discovery answers were creating spurious extra columns during markdown table splitting — now handled with placeholder-based escaping.
 
 Added `tests/test_generate_context.py` with 15 tests:
+
 - Mapping completeness (all 10 questions, all target files)
 - Confidence filtering (Low → skipped, High/Medium → generated)
 - Body text filling (TBD replacement, existing content append)
@@ -440,33 +441,67 @@ Added `tests/test_generate_context.py` with 15 tests:
 - Missing file creation safety
 - End-to-end integration flow
 
-## TASK-021 — Add context completeness report
+## TASK-021 — Context health report
 
-Status: Todo
+Status: Done
 
 Role: Implementation Agent
 
 Goal:
 
-Report which expected context files exist and which sections still need information.
+Provide a single command that reports the health and completeness of project context.
 
 Implementation Gap:
 
-There is no way to determine whether a project has sufficient context for effective AI-assisted development.
+Context files can now be generated, but there is no way to assess whether sufficient context exists for effective AI-assisted development.
 
 Acceptance Criteria:
 
-- Add a context status/check command
-- Report present context files
-- Report missing context files
-- Report obvious placeholder sections still needing completion
-- Add/update tests
+- Add `rdb context-status` ✓
+- Report expected context files ✓
+- Report missing context files ✓
+- Report sections still containing TBD placeholders ✓
+- Report low-confidence discovery answers ✓
+- Display an overall health score ✓
+- Add/update tests ✓ (26 tests)
 
 Definition of Done:
 
-- Context report command exists
-- Missing context is reported clearly
-- Tests pass
+- Command runs successfully ✓
+- Missing context is reported clearly ✓
+- Health score is displayed ✓
+- Tests pass ✓ (140 total, all passing)
+
+Result
+
+Created `src/rdb_discovery/context_status.py` module with:
+
+- `_expected_files()` — returns the 18 expected context file paths
+- `_check_expected_files()` — checks each file for existence and size
+- `_check_tbd_sections()` — scans context files for TBD/TDB placeholders (skips blank lines)
+- `_check_low_confidence()` — reads discovery-log.md for low-confidence answers
+- `compute_health_score()` — 0-100 score with weighted breakdown (45 pts file completeness, 30 pts no TBDs, 15 pts no low-conf, 10 pts discovery data)
+- `context_status()` — orchestrates all checks and returns structured report
+
+Added `rdb context-status` CLI command with:
+
+- Rich table of expected files with presence/absence indicators
+- TBD placeholder listing with file, section, and line number
+- Low-confidence discovery answer listing with ID and confidence level
+- Color-coded health score (green ≥ 70, yellow ≥ 40, red < 40)
+- Summary line showing counts
+
+Added `tests/test_context_status.py` with 26 tests across 4 classes:
+
+- TestExpectedFiles — file existence detection
+- TestTbdDetection — TBD/TDB placeholder scanning
+- TestLowConfidence — low-confidence answer detection
+- TestHealthScore — score computation and degradation
+- TestContextStatus — structured report verification
+- TestCLICommand — CLI registration, output, and edge cases
+- TestHealthScoreColor — score boundary validation
+
+All 140 tests pass.
 
 ## TASK-022 — Generate Claude Code permission profile
 
@@ -493,3 +528,31 @@ Definition of Done:
 
 - Permission profile documented
 - CLAUDE.md updated
+
+## TASK-022 — Add objectivity and efficiency guidelines
+
+Status: Todo
+
+Role: Documentation Agent
+
+Goal:
+Reduce token waste and unnecessary agreement in agent interactions.
+
+Implementation Gap:
+Agent guidance does not yet explicitly discourage praise, repeated context reading, task restatement, or unnecessary narrative output.
+
+Acceptance Criteria:
+
+- Update `context/agent-guidelines.md`
+- Add objectivity guidance
+- Add context-discipline guidance
+- Add communication-efficiency guidance
+- Add execution-efficiency guidance
+- Keep guidance concise and role-neutral
+- Add/update tests only if required
+
+Definition of Done:
+
+- `context/agent-guidelines.md` includes objectivity and efficiency guidance
+- Guidance helps reduce token usage without preventing useful technical reasoning
+- Existing workflow remains unchanged