REST + CLI mirror for loopover_plan_idea_claims

[JSONbored]

Context

The MCP tool loopover_plan_idea_claims (src/mcp/server.ts:2056) is explicitly described as "deterministic and source-free," rate-limit-only gated, calling buildClaimPlan. No REST route or CLI mirror exists.

Requirements

• Add POST /v1/loop/plan-idea-claims delegating to the same pure function.
• Add a CLI subcommand/stdio tool.

Deliverables

• POST /v1/loop/plan-idea-claims route
• CLI subcommand/stdio tool
• Unit test

Test Coverage Requirements

99%+ Codecov patch coverage on every changed line and branch in the new route/tool/CLI code, plus a test asserting output parity between the mirrored surfaces for identical input.

Expected Outcome

Idea-claim planning is available over REST/CLI, not just MCP.

Links & Resources

Precedent: POST /v1/lint/slop-risk pattern.

[linear-code]

JSO-4570

[RealDiligent]

Working on this — REST + stdio mirror for loopover_plan_idea_claims, same parity pattern as #6753.