documentation: add ADR-021 no-code-change comment and implementation plan #312
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Delete branch "documentation/2026-09-06/adr-021-no-code-change-comment"
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Commits two new docs that record the design for commenting on the source issue when the implement agent declares no code change needed:
docs/adr/021-no-code-change-comment.md— ADR-021: when the implement-agentno-code-change.jsonshort-circuit fires, pi-loop posts one deterministic comment to the source issue (never auto-closes; issue close stays a human action). Covers the comment-only rule, deterministic body composition, all-four-provider unconditional posting, fatal-on-failure (attributed to the write-back stage), the at-most-onceno-code-change-comment.jsonmarker artifact, resume mapping, and surfacing.docs/implementation-plan-no-code-change-comment.md— step-by-step plan mapping to ADR-021 §1–§9 (comment-body builder, marker artifact, post-and-mark service, pipeline wiring, summary/CLI line, resume mapping, unit seams, gated resume E2E, doc updates).Why now: the design is settled and these docs capture the decision before implementation starts. No code changes — documentation only.