feat: harness contract and plugin SPI (plan 1 of 3) - #181

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feat/harness-contract

Commits on Sep 16, 2026

feat(agents): 1/6 — declare a HarnessContract on every agent and validate registrations

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refactor(agents): 2/6 — declare cost_log_tags on the base Agent constructor

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feat(agents): 3/6 — honor tool restrictions natively on Pi, OpenCode and Antigravity

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feat(orchestration): 4/6 — per-kind by_type defaults and the resolution-time harness contract check

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feat(agents): 3b/6 — declare permission_modes and a closed tool-name map per harness

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feat(orchestration): 4r/6 — reject permission_mode values and tool names a harness cannot honor

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feat(lint): 5/6 — CE068 keeps kind names out of the kernel; add the coder_eval.spi surface

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docs(agents): 6/6 — generate the agent-field contract tables and add the harness conformance test

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fix: code review fixes for the harness contract and SPI plan

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chore: defer three harness candidates from the harness contract plan

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fix(agents): four review findings in the turn cap, the drain retry, teardown and the early-stop ceiling

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fix(limits): clarify docstring for RunLimits class to better describe task caps

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