Content writer: save_journey() helper (#1385)

[CraigBuckmaster]

Summary

Closes #1385 (Phase 1 — Foundation for Epic #1379)

Adds save_journey(journey_type, data) to _tools/content_writer.py — a validated writer for journey JSON files, following the save_chapter() pattern.

Validations

• journey_type must be one of thematic, concept, person
• data['journey_type'] must match the argument
• id must be lowercase alphanumeric + hyphens
• title, description, stops required and non-empty
• stop_order must be sequential starting at 1
• bridge_to_next required (non-empty) on all stops except final; must be null on final stop

Output

Writes to content/meta/journeys/{type}/{id}.json

Test plan

• Valid journey writes correctly
• Invalid journey_type raises ValueError
• Non-sequential stop_order raises ValueError
• bridge_to_next on final stop raises ValueError
• Test file cleaned up after verification

https://claude.ai/code/session_01Qj6otahNBTSak3fdYhFpes

[github-actions]

Content Pipeline Results

✅ All pipeline checks passed

Step	Status	Details
Schema Validation	✅	128476 passed, 76 failed
Build DB	✅	—
DB Integrity	✅	88 passed, 0 failed

[github-actions]

Test Results

✅ All tests passed

	Passed	Failed	Total
Tests	✅ 3209	❌ 0	3209
Suites	✅ 429	❌ 0	429

Coverage

Statements	Branches	Functions	Lines
—	—	—	—

⏱️ Duration: 77.4s