feat(mcp): gittensory_remediation_plan

[JSONbored]

Parent roadmap: #525
Parent phase: #544

Background

buildLocalBranchAnalysis already produces branchQualityBlockers/accountStateBlockers/scoreBlockers, but there is no consolidated ordered "do these N things" plan.

Goal

New MCP tool gittensory_remediation_plan that turns the blocker lists into an ordered, deduplicated fix-it checklist with rerun conditions.

Current Behavior

Blockers are listed but unordered and scattered across the analysis.

Desired Behavior

Consumes the *Blockers[] + recommendedRerunCondition from buildLocalBranchAnalysis (local-branch.ts:176) and emits a prioritized checklist (highest-impact first), each item with the rerun condition that clears it. Metadata only.

Implementation Requirements

• Register in src/mcp/server.ts + package bin; outputSchema.

Public/Private Output Boundaries

• Public-safe steps (authored to pass the shared filter so they can go into a PR body).

Acceptance Criteria

• Given a branch with multiple blockers, returns a correctly-ordered, deduped remediation plan.

Testing Requirements

• npm run test:ci, 97%+ coverage. Ordering/dedup tests + forbidden-term assertions.