jordan 4f076c927d feat: M0p1 runtime skeleton, M0p2 tooling & diagnostics, m1p4 signal ledger

## M0p1 — Embeddable Runtime Skeleton (329 tests)
- TidalDb with builder(), health_check(), close(), and Drop-based cleanup
- TidalDbBuilder fluent API: ephemeral(), with_data_dir(), wal_dir(), cache_dir()
- Config, StorageMode, ConfigError types; Config(ConfigError) variant on LumenError
- Paths: single source of truth for directory layout (wal, items, users, creators, cache)
- TempTidalHome: test isolation helper gated behind #[cfg(test)] / test-utils feature
- 8 integration tests: tests/sandboxed_storage.rs

## M0p2 — Tooling & Diagnostics (349 tests)
- Workspace root Cargo.toml (members: ["tidal", "tidalctl"])
- tidal/build.rs: BUILD_HASH from GIT_HASH with option_env!() fallback to "dev"
- MetricsState: always-compiled Arc-shared atomics (uptime, health_ok)
- MetricsHandle (metrics feature): hand-rolled TcpListener HTTP, zero new deps
  - GET /healthz → {"status":"ok","uptime_secs":N}
  - GET /metrics → Prometheus text (tidaldb_uptime_seconds, health_ok, info)
- TidalDbBuilder.enable_metrics(addr) starts background metrics thread
- tidalctl binary: status + paths commands, manual std::env::args() parsing
- 7 metrics integration tests, 9 tidalctl CLI tests

## m1p4 Signal Ledger (in-progress)
- SignalLedger: DashMap<(EntityId, SignalTypeId), EntitySignalEntry>, WAL-first writes
- HotSignalState: #[repr(C, align(64))], lock-free CAS decay, out-of-order handling
- BucketedCounter: 60 per-minute + 168 per-hour circular buffers, trigger-based rotation
- CheckpointMeta + serialize/restore: 983-byte fixed records, atomic WriteBatch
- Property tests: running score matches analytical to 1e-6, decay monotonic, non-negative
- Proptest regression: signals/warm.txt

## Documentation and planning
- ROADMAP: m0p1 COMPLETE (329), m0p2 COMPLETE (349), product track milestones
- PRODUCT_ROADMAP: P0-P4 product milestone track (personal briefing beachhead)
- Milestone planning docs: milestone-0 (phases 1-3), milestone-p (phases 1-5)
- docs/research/tidaldb_tooling_and_diagnostics.md
- ARCHITECTURE.md, CLAUDE.md, VISION.md updates

## Site
- Blog: every-platform-builds-the-same-6-systems.mdx (new)
- Blog: why-tidaldb.mdx (updated)
- next.config.ts, layout.tsx, blog/page.tsx updates

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-02-20 20:32:00 -07:00

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Task 02 — Metrics / Health Surface

Goal: expose runtime stats (uptime, WAL lag, open handles) without requiring full observability stack.

Deliverables

Optional HTTP endpoint (disabled by default) serving /metrics (Prometheus text) and /healthz (JSON).
Builder flag enable_metrics(addr) + with_metrics(false) toggle for tests.
Metrics counters tagged with process, partition_id, build_hash for future distributed rollouts.

Acceptance Criteria

Endpoint can run on the same Tokio runtime as host service (returns Future implementor).
Minimal deps (hyper/tiny_http) to keep embeddable footprint light.
Integration test hits /metrics and asserts counters increment when WAL appends.

725 B Raw Blame History

Task 02 — Metrics / Health Surface

Deliverables

Acceptance Criteria

725 B

Raw Blame History