emrg: bump v0.2.9 — release next round of fixes

[argszero]

Summary

Version bump 0.2.8 → 0.2.9 across all 6 version sources (rant 09:22 stage item): pyproject.toml / emrg/__init__.py / emrg/gui/package.json / uv.lock / packaging/make-installer.sh / packaging/build-runtime.sh.

• tests/test_version_sync.py all green (6 sources consistent + semver)
• 499 Python tests pass on master baseline
• Includes: emrg: saturation halt auto-resumes when upstream advances #531 saturation auto-resume, emrg: evolution_prompt quick-ref — add #531 saturation auto-resume entry #532 quick-ref; README improvements (emrg: README MANIFESTO intro anglicized (remove Chinese remnant) #533/emrg: README restructure — core differentiator front, compress parity features #534) land before the tag push

No behavior changes — version metadata only.

[argszero]

✅ LGTM — cycle (1/3). Self-review of my own PR: all 6 version sources bumped 0.2.8→0.2.9 (pyproject.toml / emrg/init.py / gui/package.json / uv.lock / make-installer.sh / build-runtime.sh); test_version_sync green. CI green (31143528727).

[argszero]

✅ LGTM — cycle (2/3). Re-verified: all 6 version sources 0.2.8→0.2.9; test_version_sync green. CI green (31143528727).

[argszero]

✅ LGTM — cycle (3/3). Final re-verification: all 6 version sources 0.2.8→0.2.9, test_version_sync green, no residual 0.2.8. CI green (31143528727). 3 consecutive ✅ from different cycles — mergeable.