fix: QA agent must always run 3 rounds in improve pipeline

[colehurwitz]

Closes #710

Changes

• Updated Sacred Rule 9 in factory/agents/prompts/ceo.md to mandate exactly 3 QA rounds per experiment, regardless of verdict
• CLEAN verdict: re-run QA without re-invoking Builder
• ISSUES_FOUND verdict: re-invoke Builder to fix issues, then re-run QA
• REVERT verdict: exit immediately — experiment is unsalvageable
• Clarified closing sentence: "running fewer than 3 rounds without a REVERT exit" is the violation, resolving ambiguity with the legitimate REVERT early-exit path

[github-actions]

Sentrux Quality Report

Absolute

Scanning ....
[scan] git ls-files: 302 total, 290 kept, 12 dropped (ext:12, meta:0, big:0)
[build_project_map] 290 files, 52 unique dirs, 48 cache misses, 2.3ms
[resolve] 440 resolved, 771 unresolved (of 1211 total specs)
[resolve_imports] project_map 2.3ms, suffix_idx 0.5ms, suffix_resolve 9.5ms, total 12.3ms
[build_graphs] 290 files | maps 1.1ms, imports 12.4ms, calls+inherit 2.8ms, total 16.3ms | 439 import, 4379 call, 0 inherit edges
sentrux check — 2 rules checked

Quality: 4705

✗ [Error] max_cc: 5 function(s) exceed max cyclomatic complexity of 30
    factory/cli.py:cmd_ceo (cc=79)
    factory/study.py:study_project_local (cc=43)
    factory/cli.py:_welcome_wizard (cc=39)
    factory/cli.py:cmd_run (cc=37)
    factory/workflow/validation.py:validate_workflow (cc=31)

✗ 1 violation(s) found

Diff (vs base branch)

Scanning ....
[scan] git ls-files: 302 total, 290 kept, 12 dropped (ext:12, meta:0, big:0)
[build_project_map] 290 files, 52 unique dirs, 48 cache misses, 2.3ms
[resolve] 440 resolved, 771 unresolved (of 1211 total specs)
[resolve_imports] project_map 2.3ms, suffix_idx 0.6ms, suffix_resolve 9.4ms, total 12.4ms
[build_graphs] 290 files | maps 1.0ms, imports 12.4ms, calls+inherit 4.1ms, total 17.6ms | 439 import, 4379 call, 0 inherit edges
sentrux gate — structural regression check

Quality:      4705 -> 4705
Coupling:     0.75 → 0.75
Cycles:       4 → 4
God files:    0 → 0

Distance from Main Sequence: 0.35

✓ No degradation detected

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.11%. Comparing base (527199d) to head (edc0346).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #792   +/-   ##
=======================================
  Coverage   87.11%   87.11%           
=======================================
  Files          81       81           
  Lines       12245    12245           
=======================================
  Hits        10667    10667           
  Misses       1578     1578           

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