release: v2.15.0

[tcconnally]

Version bump v2.14.0 → v2.15.0. Ships the capacity/retention/DB-resolution arc plus the deploy-surface rename completion merged this cycle.

Highlights since v2.14.0:

• Deploy-surface rename completed (fix(onboarding): finish Mimir → Perseus Vault rename on the deploy surface #429): client setup docs, all 8 MCP client snippets, smithery.yaml, manifest.json, framework integration docs, transport docs, clawhub skill, and awesome-mimir.md now use the perseus-vault command + canonical DB path — fresh operators get a working config.
• bootstrap.sh build-from-source repaired (Default DB resolution: when both ~/mimir.db (live) and ~/.mimir/data/mimir.db (stale-empty) exist, the empty one still wins #424/fix(#424): factor DB emptiness into default resolution; repair bootstrap.sh binary name #425): was cp-ing a target/release/mimir binary the perseus-vault crate no longer produces.
• Empty-DB-aware default resolution (Default DB resolution: when both ~/mimir.db (live) and ~/.mimir/data/mimir.db (stale-empty) exist, the empty one still wins #424): a stale-empty higher-precedence DB no longer shadows a live lower-precedence one.
• Retention/purge (entity_history and journal grow without bound — even purge doesn't delete history (retention/compaction design needed) #398/journal has no workspace_hash column — purge's journal redaction over-redacts cross-workspace same-key rows #417), background auto-embed (Synchronous auto-embed adds 6.7ms to every content-changing write (62×) — defer to a background worker #393), FTS selectivity (FTS recall cost is O(total entities), not O(hits) — a 20-hit query costs the same as a 33k-hit query #401), cohere lock window (cohere holds the writer lock ~4.4s at 100k entities — crosses the 5s busy_timeout just past current test scale #400), web/gRPC pooling (Web dashboard and gRPC wrap the pooled Database in a global Mutex — single-lane on the enterprise-facing surfaces; /api/graph unbounded #402), follow workspace scoping (follow() needs a workspace parameter — workspace-scoped agents stamp efficacy onto a row they never saw #396), perf-gate (CI: add a concurrency gate (promote the pool load test at 2× oversubscription) and a perf gate pinning the 2026-07-02 baselines #404).

Cargo.toml/lock, README badge, manifest.json, server.json → 2.15.0; CHANGELOG [Unreleased] → [2.15.0]. Manifest/lock consistency verified.

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