feat(content): add reindex endpoint for re-embedding after manual edits

[deepakdevp]

Summary

• Adds POST /api/v1/content/reindex endpoint that re-embeds existing .abstract.md/.overview.md content into the vector database after manual edits
• Supports optional regenerate=true mode that regenerates L0/L1 summaries via LLM before re-embedding
• Includes request validation (URI existence check, schema validation) and tests

Addresses #468

Changes Made

• openviking/server/routers/content.py: Added ReindexRequest model and POST /reindex endpoint. Uses existing ResourceService.build_index() for re-embed and ResourceService.summarize() for regenerate mode.
• tests/server/test_api_content.py: Added 3 tests — request validation (missing uri → 422), endpoint registration (GET → 405), and schema validation.

API

# Re-embed existing content (after manual edit to .overview.md)
curl -X POST http://localhost:1933/api/v1/content/reindex \
  -H "Content-Type: application/json" \
  -d '{"uri": "viking://resources/my_project/doc_dir"}'

# Regenerate L0/L1 via LLM + re-embed
curl -X POST http://localhost:1933/api/v1/content/reindex \
  -H "Content-Type: application/json" \
  -d '{"uri": "viking://resources/my_project/doc_dir", "regenerate": true}'

Type of Change

• New feature (non-breaking change which adds functionality)

Testing

• Tests added
• Unit tests pass locally (pytest tests/server/test_api_content.py — 6/6 pass)
• Tested on macOS

Checklist

• My code follows the code style of this project (ruff check + format pass)
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

🤖 Generated with Claude Code

[MaojiaSheng]

reindex should be a transaction and it needs more management

[deepakdevp]

Thanks for the feedback @MaojiaSheng! I'll look into wrapping the reindex operation with TransactionManager and adding progress tracking via TaskTracker. Will push an update.

[CLAassistant]

All committers have signed the CLA.

[MaojiaSheng]

@deepakdevp That's cool !!