refactor(humaninloop): bring task-architect to AGENT-GUIDELINES compliance

[deepeshBodh]

Summary

• Remove all 5 coupling leaks from task-architect.md: phase branching, hardcoded artifact paths, sibling agent awareness, workflow schema knowledge, and sequencing knowledge
• Add AGENT-GUIDELINES compliant sections: 3 <example> blocks, experiential Core Identity, What You Produce, Quality Standards (character traits), What You Reject, What You Embrace
• Migrate process content to patterns-vertical-tdd skill: TEST: verification format (Setup/Action/Assert/Capture), [NEW] and [GAP:XXX] brownfield markers, plan artifact translation notes
• Update all examples in CYCLE-STRUCTURE.md from legacy "Demo" style to TEST: format

Agent changes (task-architect.md)

• Word count: ~2,800 (over max) → 760 (in target 500-1,500)
• Coupling leaks: 5 of 5 → 0
• Audit verdict: PASS WITH NOTES (all notes addressed)

Skill changes (patterns-vertical-tdd)

• Added [NEW] and [GAP:XXX] markers to SKILL.md and CYCLE-STRUCTURE.md
• Added brownfield translation from plan artifacts
• Updated standard cycle format to use TEST: format
• Updated Task 4 from "Demo and Validate" to "Verify with Real Infrastructure"
• Added verification task and brownfield marker items to quality checklist
• Fixed second-person writing in Red Flags section (imperative form)
• Updated all legacy "Demo" examples in CYCLE-STRUCTURE.md to TEST: format
• Audit verdict: PASS WITH NOTES

Test plan

• Verify task-architect invokes patterns-vertical-tdd skill rather than improvising cycle structure
• Verify task-architect maintains persona under pressure (e.g., "skip TDD, just list the tasks")
• Verify zero coupling leaks: agent works with any workflow, paths, and sibling agents
• Verify TEST: format examples in CYCLE-STRUCTURE.md render correctly

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