emrg: bump v0.2.10 — release #539 flaky session ID fix + README/scheduler work

[argszero]

Summary

Version bump 0.2.9 → 0.2.10 across all 6 version sources (rant 11:59): pyproject.toml / emrg/__init__.py / emrg/gui/package.json / uv.lock / packaging/make-installer.sh / packaging/build-runtime.sh.

Release includes:

• emrg: fix flaky session ID uniqueness test — 16-bit → 32-bit entropy #539 flaky session ID fix (16-bit → 32-bit entropy)
• emrg: README MANIFESTO intro anglicized (remove Chinese remnant) #533/emrg: README restructure — core differentiator front, compress parity features #534 README restructure (core differentiator front + MANIFESTO intro anglicized)
• emrg: scheduler self-heal — ensure projects.yml emrg entry on startup #535 scheduler projects.yml self-heal
• emrg: evolution_prompt quick-ref — add #533/#534 README entries #537/emrg: evolution_prompt quick-ref — add #535 scheduler projects.yml self-heal entry #538 evolution_prompt quick-ref updates

tests/test_version_sync.py all green (6 sources consistent + semver); 502 Python tests pass. No behavior changes — version metadata only.

[argszero]

✅ LGTM — cycle (1/3). Self-review: all 6 version sources bumped 0.2.9→0.2.10; version_sync green; 502 tests pass; no residual 0.2.9.

[argszero]

✅ LGTM — cycle (1/3). Self-review: all 6 version sources bumped 0.2.9→0.2.10; version_sync green; 502 tests pass; no residual 0.2.9.

[argszero]

✅ LGTM — cycle (2/3). Re-verified: all 6 version sources 0.2.9→0.2.10 (pyproject/init/gui package.json/uv.lock/make-installer/build-runtime); version_sync green; 502 tests pass; no residual 0.2.9. CI green (31146186541).

[argszero]

✅ LGTM — cycle (3/3). Final re-verification: all 6 version sources 0.2.9→0.2.10; version_sync green; 502 tests pass; no residual. CI green (31146186541). 3 consecutive ✅ from different cycles — mergeable.