feat(v2): complete v2 reimplementation

AGENTS.md

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+# Agent Operating Instructions
+
+## Continuous milestone execution
+
+When the user asks to continue, work autonomously through the active milestone
+and its verification. Do **not** send progress-only, acknowledgement, empty, or
+status final responses. Reply only when:
+
+1. the user asks for status;
+2. a real product, security, credentials, or destructive-action decision needs
+   the user's input; or
+3. the requested milestone is fully implemented and verified.
+
+Use one foreground milestone batch where possible. If work must run in a
+background subagent, avoid notifying the user manually; inspect and verify the
+result before replying at the same completion boundary.
+
+A chat turn still necessarily ends after a model response. This file prevents
+unnecessary model-generated completion messages; it cannot suppress
+harness-generated tool or subagent notifications.
+
+## Verification
+
+Before claiming a milestone boundary, run `make check` and record focused
+acceptance evidence under `docs/release/`.