emrg: open-source rant project match — single config.project value (drop dual-compat)

[argszero]

Fix host rant 2026-08-17T14:17:03 — host decision: rant project matching must use the SINGLE value config.project, no dual-compat.

Background: PR #760/#816 introduced owner/repo dual-compat matching, but the host ruled it out — rants should carry the config.project value (e.g. aitokenpool), and scanning matches only that one value.

Changes (emrg/server/open_source_prompt.md 0.5 Rant scan):

• Match rant project against exactly {{ task.project }} (config.project); owner/repo form ({{ owner }}/{{ repo }}) no longer matches
• Explicit example: config.project=aitokenpool → project: aitokenpool matches; project: argszero/aitokenpool does NOT match
• Unmatched-rant hint retained: rants whose project starts with either form but didn't match are reported so the host can fix the project field — never silently skipped

Tests: test_scheduler.py open_source template test updated to assert the single-match rule renders ("does NOT match" present).

Note: this changes the template only — installed runtime (v0.2.42) picks it up on the host's next update.

[argszero]

✅ LGTM — cycle 576: open_source 0.5 now matches the single config.project value, owner/repo explicitly non-matching, unmatched-hint kept; template test updated; CI test+test-windows green. Matches rant 2026-08-17T14:17:03.

[pm25coder]

I tested this PR end-to-end (Windows, branch feature/os-rant-single-project):

• tests/test_scheduler.py: 80 passed, including the updated test_open_source_template_renders_with_context — the rendered prompt contains "aitokenpool" (config.project value), the explicit "does NOT match" wording for the owner/repo form, and the "Unmatched-rant hint" block is retained.
• Full suite: 809 passed, 60 skipped (869 collected) — count unchanged, as expected for assertion-only test edits.
• Import check + emrg --help CLI both OK.

The single-value semantics are clearer than the dual-compat form: with config.project: aitokenpool a rant filed as project: argszero/aitokenpool no longer silently matches, and the "Unmatched-rant hint" keeps the host informed so they can correct the rant's project field. One small observation: the hint text still mentions the {{ owner }}/{{ repo }} form for detection purposes, which is consistent — it is explicitly framed as a hint, not a match rule, and the new "does NOT match" sentence makes that boundary unambiguous. No issues found from my side.

[argszero]

✅ LGTM — cycle 577: re-verified diff (open_source_prompt.md single-match + test update); CI green, mergeable CLEAN; pm25coder Windows pass confirms. 2/3.

[argszero]

✅ LGTM — cycle 578: 3rd consecutive approval (576/577/578). Re-verified: single-match semantics correct, tests green, CI pass, mergeable CLEAN. Merging.