chore: v0.1.0 release prep — docs, CI, and two-tier e2e

[liuhaoyang]

Summary

Closes out the remaining v0.1.0 items from docs/ROADMAP.md (documentation, CI polish, e2e testing) in preparation for the project's first tagged release.

Changes

Docs

• Split the README feature lists (English + 简体中文) into Implemented (v0.1.0) vs Planned (v2.0 / v3.0), anchored to docs/ROADMAP.md.
• Added a Documentation section linking docs/README.md and docs/ROADMAP.md, plus build-status and license badges.

CI

• Added concurrency guards to dotnet-build.yml, codeql.yml, and docker.yml.
• Added release.yml: on a v* tag push, builds/tests and publishes a GitHub Release from CHANGELOG.md. No image publishing.
• Added e2e.yml (ubuntu-only): runs the new e2e suites.

End-to-end tests (new e2e/)

Two-tier e2e, isolated in its own e2e/Mocha.E2E.sln (deliberately not in Mocha.sln, so CI dotnet test and the release image builds are unaffected):

• Tier 1 — full-stack black-box (Mocha.EndToEnd): brings up the docker-compose stack, drives OTLP trace + metrics into the Distributor (:4317), asserts read-back through the Query API (:5775, Jaeger + Prometheus). Cases are declarative YAML under e2e/cases/.
• Tier 2 — single-component (Mocha.E2E.Component.Tests): xUnit + Testcontainers against real MySQL 8.2 and InfluxDB 2.7, closing the gap where storage was only tested with EF Core InMemory and InfluxDB had no tests.

Verification

• dotnet build e2e/Mocha.E2E.sln: 0 warnings / 0 errors; dotnet format --verify-no-changes: clean.
• Tier-1 (LiteDB) and Tier-2 (real MySQL + InfluxDB) both pass locally.
• Mocha.sln and src/ are unchanged; no build artifacts committed.

Notes

• CHANGELOG.md 0.1.0 date is still TBD — to be stamped at tag time.
• No Docker images are published by any workflow in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.24%. Comparing base (81c8167) to head (ff2e300).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   71.26%   71.24%   -0.03%     
==========================================
  Files         156      156              
  Lines        4023     4023              
  Branches      528      528              
==========================================
- Hits         2867     2866       -1     
  Misses        991      991              
- Partials      165      166       +1     

see 1 file with indirect coverage changes

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[latte-gh]

LGTM. Reviewed across all three commits:

docs (README split): Badges, Implemented vs Planned split, and Documentation section are clean and accurate.

ci (concurrency + release.yml + e2e.yml): Concurrency guards correct, release.yml follows least-privilege permissions, e2e.yml correctly separates blocking Tier1 from informational Tier2.

test (two-tier e2e): Structural isolation of e2e into its own Mocha.E2E.sln is sound - root dotnet build/test and Dockerfiles are untouched. All .cs files have MIT headers and follow code conventions. run-e2e.sh is well-structured with proper teardown and readiness waits.

No blocking findings.

[latte-gh]

LGTM. Re-verified new signed head 63cd97f: all 3 commits carry valid GPG signatures (verified=true, key F68A88A16643607E), content is identical to previously-approved bd809a8 (range-diff clean, same 28 files / +2357 / -37). e2e isolation, release.yml safety, concurrency guards, and README split all remain as previously reviewed. No blocking findings.

[latte-gh]

LGTM. New commit ff2e300 adds the CHANGELOG 0.1.0 date (2026-07-28), one-line change, valid GPG signature. Ready to merge once CI passes.