fix(implementation): remove integration context mechanism

[leeovery]

Summary

• Remove all PR Add integration context and codebase cohesion to agent-based implementation #79 additions (integration context mechanism) that caused a "convention gravity well" where early design choices got documented as established patterns and later tasks faithfully propagated them
• V2 without this mechanism won 21/23 tasks across all 5 phases in comparative testing
• Keep beneficial changes from PRs Fix executor re-attempt to include full task content #77 (full re-attempt context), Add fix analysis to reviewer and fix_gate_mode #78 (fix recommendations, fix_gate_mode), and Add implementation polish agent #80 (polish agent)

What was removed

• Integration context file accumulation ({topic}-context.md) and all references
• Plan file access for per-task executor (kept for polish agent which legitimately needs it)
• Expanded exploration instructions (7 bullets → V2's 3 bullets)
• Codebase Cohesion review dimension (feat: add technical-implementation skill #6) — reviewer now has 5 dimensions
• INTEGRATION_NOTES, COHESION_NOTES, CODEBASE_COHESION output fields
• Convention Consistency section from code-quality.md

Files changed (9)

• agents/implementation-task-executor.md
• agents/implementation-task-reviewer.md
• agents/implementation-polish.md
• skills/technical-implementation/SKILL.md
• skills/technical-implementation/references/code-quality.md
• skills/technical-implementation/references/steps/invoke-executor.md
• skills/technical-implementation/references/steps/invoke-reviewer.md
• skills/technical-implementation/references/steps/invoke-polish.md
• skills/technical-implementation/references/steps/task-loop.md

Test plan

• Grep for orphaned references: integration context, INTEGRATION_NOTES, COHESION_NOTES, CODEBASE_COHESION, Convention Consistency — all clear
• Verify reviewer says "five" not "six" in process step and hard rules
• Verify executor has 5 standard + 2 re-attempt inputs
• Verify reviewer has 3 inputs
• Verify polish agent has 6 inputs
• Read each file end-to-end for orphaned sentences

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