emrg: bump v0.2.15 — saturation heartbeat + GUI fixes + G129/G130 hardening

[argszero]

Version bump 0.2.14 → 0.2.15 per host authorization (rant 2026-08-09T10:09:37+08:00: release new work merged after v0.2.14; host will verify on Windows/macOS after release).

Work included since v0.2.14 (tag v0.2.14):

• emrg: saturation halt → low-frequency heartbeat full cycles (rant 09:35:55) #585 saturation heartbeat: saturation halt → low-frequency full cycles (rant 09:35:55)
• emrg: GUI fixes — tool spinner, typing cursor, markdown prefix (rants 21:08/21:09/21:10) #580 GUI fixes: tool spinner / typing cursor / markdown prefix (host Windows GUI rants 21:08/21:09/21:10)
• emrg: isolate GUI test port file + alert on scheduler connect failures (rant 08:03) #583 GUI test port-file isolation + scheduler connect-failure alert
• emrg: Windows tree-kill for integration tests — no orphan daemons (G130) #587 Windows tree-kill for integration tests (G130)
• emrg: stop swallowing AuthError + programming errors in stale check (G129) #589/emrg: evolution_prompt quick-ref — add #589 G129 stale-check exception narrowing entry #590 stale-check AuthError hardening + quick-ref (G129)

7 files, 8+/8- (emrg/init.py, emrg/gui/package.json, emrg/gui/package-lock.json ×2, pyproject.toml, uv.lock, packaging/build-runtime.sh, packaging/make-installer.sh).

[argszero]

✅ LGTM — cycle

Version bump 0.2.14 → 0.2.15 per host release authorization (rant 2026-08-09T10:09:37+08:00). Pure version bump: 7 files, 8+/8- — emrg/init.py, emrg/gui/package.json, emrg/gui/package-lock.json (×2), pyproject.toml, uv.lock, packaging/build-runtime.sh, packaging/make-installer.sh. All 8 references verified consistent at 0.2.15. Release flow per convention: merge → tag v0.2.15 → Build Release → GitHub Release (6 assets).

[argszero]

✅ LGTM — cycle

Verified: pure version bump 0.2.14 → 0.2.15 across all 7 version files (8 references: emrg/init.py, emrg/gui/package.json, emrg/gui/package-lock.json ×2, pyproject.toml, uv.lock, packaging/build-runtime.sh, packaging/make-installer.sh). The only remaining 0.2.14 string is a historical quick-ref changelog entry in evolution_prompt.md (not a version constant). Branch Test run green (31289858637).

[argszero]

✅ LGTM — cycle (3). Third independent-cycle approval. Pure version bump 0.2.14 → 0.2.15 (7 files, 8+/8-), all 8 references consistent; Test CI 31289858637 SUCCESS; locally verified 641 pytest + import + --help + version=0.2.15. Mergeable.