Synapse v2.1.3 — "overview at boot"

Patch release fixing a freshly-booted default vault's Overview section being permanently stuck at 0 in the NavTree. No schema migrations.

Fixed

• Boot vault never indexed overview.md/index.md/log.md: index_bootstrap_meta_files() (added in an earlier release, NC-3) was only ever wired into POST /projects, so a newly-created project vault got its 3 meta files indexed as Page rows immediately. The boot vault (settings.vault_root, bootstrapped by bootstrap_vault() in the app's lifespan startup — what a single-vault install actually uses) never got the same call: overview.md/index.md/log.md existed on disk but had zero Page rows until an ingest queue-drain happened to touch overview.md (2.1.2, ADR-0089). A freshly-booted default vault therefore showed a permanent "OVERVIEW: 0" in the NavTree with no way to make it appear short of running an ingest. Fixed by calling the same indexer for the boot vault right after _seed_vault_state() in lifespan startup — idempotent and I1-compliant (targeted 3-file index, no vault scan).
• E2E test-locator regression surfaced by the fix above (not a product bug): since overview.md is now indexed at boot and — by design — always sorts first in the tree (a singleton entry-point, deliberately excluded from the knowledge graph), 6 E2E locators across csp.spec.ts/shell-m4-phase1.spec.ts/v09-happy-paths.spec.ts that picked "the first page row" assuming it would be a normal graph-backed content page needed to exclude it explicitly.

Upgrade notes

No schema migrations. On upgrade, a freshly-booted default vault will show pages under Overview immediately rather than only after the first ingest run.