Plan: the MCP phase replanned around beam_mcp as the server core - #9
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Owner decisions of 2026-09-08, accepted in full on 2026-09-20 with the review that reconciled the research documents against both trees. Recorded as ADR-0007 decisions 5 to 8 by append; decision 3 is superseded and its candidate list is history. Slice 059 is rewritten from a library selection spike into a capability-gap measurement (fifteen checklist rows, each a FINDINGS row with a path and line at the pinned beam_mcp commit), a probe of the :server seam on a throwaway branch that is never merged, and the addition of beam_mcp as a dependency behind the Trinity.MCP boundary. Size M to S/M. Slice 060 becomes Trinity's thin driver over beam_mcp's public functions, with the rule as a census test (AC7): the driver builds the outbound JSON-RPC request and nothing else of the protocol. The M/L condition is decided (no library ships a client): L. The OAuth client role moves to 062. Slice 061 gains a dependencies-and-blockers block: input_required waits on the MRTR wrapper or the recorded refusal of the seam; resultType on server/discover is a core gap; ttlMs and cacheScope shipped in 0.5.0 and are not a dependency; replay defence is Trinity's, per partition plus idempotent effects. Slice 062 owns authorization in every role: the OAuth client role arrives from 060 as AC8; a non-person identity note is recorded for a later amendment with no criterion yet. The four Milestone headers on 059 to 062 read M5a Automates, as ROADMAP.md has since 2026-09-08. R14 is re-scoped to the will-not-implement gap; R15 (LGPL) is closed. lib/trinity/versions.ex carries a beam_mcp ~> 0.8 row in place of the undecided MCP library row; VERSIONS.md regenerated. plan_check: PASS. trinity.names: OK. versions.gen --check: OK. The slice count is unchanged at 36 and the change log says so. Signed-off-by: Ayla Croft <aylacroft@proton.me>
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Change 1 of the 2026-09-20 plan. ADR-0007 decisions 5 to 8 appended; slices 059 to 062 amended; ROADMAP rows and change log; R14 re-scoped and R15 closed; beam_mcp version row. Slice 010 opens after this lands. The commit message carries the detail and the local check results.