fix: skip issue creation when focus mode targets an existing GitHub issue

[colehurwitz]

Closes #693

Changes

• Added an "Issue Reuse (Focus Mode)" subsection to the CEO prompt's Parallel Execution Protocol section in factory/agents/prompts/ceo.md
• When the CEO task contains an ## Issue Tracking section (injected by the CLI when --focus targets an existing GitHub issue), the CEO now skips gh issue create and uses the existing issue number instead
• Normal flow (no Issue Tracking section) remains unchanged — a new issue is created as before

[github-actions]

Sentrux Quality Report

Absolute

Scanning ....
[scan] git ls-files: 296 total, 284 kept, 12 dropped (ext:12, meta:0, big:0)
[build_project_map] 284 files, 52 unique dirs, 48 cache misses, 2.5ms
[resolve] 428 resolved, 741 unresolved (of 1169 total specs)
[resolve_imports] project_map 2.6ms, suffix_idx 0.6ms, suffix_resolve 11.6ms, total 14.7ms
[build_graphs] 284 files | maps 1.1ms, imports 14.8ms, calls+inherit 4.3ms, total 20.2ms | 427 import, 4329 call, 0 inherit edges
sentrux check — 2 rules checked

Quality: 4717

✗ [Error] max_cc: 5 function(s) exceed max cyclomatic complexity of 30
    factory/cli.py:cmd_ceo (cc=78)
    factory/cli.py:_welcome_wizard (cc=39)
    factory/cli.py:cmd_run (cc=36)
    factory/study.py:study_project_local (cc=36)
    factory/workflow/validation.py:validate_workflow (cc=31)

✗ 1 violation(s) found

Diff (vs base branch)

Scanning ....
[scan] git ls-files: 296 total, 284 kept, 12 dropped (ext:12, meta:0, big:0)
[build_project_map] 284 files, 52 unique dirs, 48 cache misses, 2.5ms
[resolve] 428 resolved, 741 unresolved (of 1169 total specs)
[resolve_imports] project_map 2.5ms, suffix_idx 0.6ms, suffix_resolve 9.1ms, total 12.2ms
[build_graphs] 284 files | maps 1.0ms, imports 12.3ms, calls+inherit 3.9ms, total 17.2ms | 427 import, 4329 call, 0 inherit edges
sentrux gate — structural regression check

Quality:      4717 -> 4717
Coupling:     0.74 → 0.74
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 86.83%. Comparing base (3803ea6) to head (ae92ede).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #764   +/-   ##
=======================================
  Coverage   86.83%   86.83%           
=======================================
  Files          79       79           
  Lines       11912    11912           
=======================================
  Hits        10344    10344           
  Misses       1568     1568           

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