Move plan-manager as a script

[isolomatov-gd]

Problem: MCP is server hosted, plan may contain sensitive information
Solution: Move plan_manager as skill
Decision to be made:

• Use typescript npm package instead of the script: easier to update and use (npx)
• Implement Rosetta Local MCP using typescript and STDIO - can access MCP sampling and add other local features.
• Continue to use *.js file in skill

[github-actions]

Rosetta Triage Review

Summary: This PR migrates the plan_manager functionality from a server-hosted Redis-backed MCP tool to a client-side JavaScript skill (plan_manager.js), allowing agents to track execution plans locally without sending potentially sensitive plan data to the Rosetta MCP server.

Findings:

• Bug — Dangling reference in SKILL.md: The <resources> section of instructions/r2/core/skills/plan-manager/SKILL.md contains USE FLOW adhoc-flow-with-plan-manager``, but that workflow file is deleted in this same PR. Any agent that loads the skill and tries to follow this reference will fail to resolve it.
• Open architectural decision unresolved: The PR body explicitly flags an undecided question — whether to ship the skill as a plain JS file or as an npx-invocable TypeScript package. This ambiguity may make the implementation hard to evolve post-merge; the decision should be made and recorded before merging.
• Plans folder committed: plans/plan-manager-skills/ (discovery notes, plan, specs) is committed to the repo. Per Rosetta workspace conventions, plans/ holds temporary execution artifacts and should be excluded from SCM. These files add repository noise.
• ARCHITECTURE.md MCP tools table not updated: The table still describes plan_manager (opt-in) as storing plans in Redis. Since this PR adds a local-file alternative, the table should clarify the relationship between the MCP tool and the new skill (e.g., plan_manager MCP remains for users with Redis; the skill is the fallback).
• Spec deviation: plans/plan-manager-skills/plan-manager-PLAN.md Task 7 says to update the three adhoc-flow-with-plan-manager.md copies; the actual implementation deletes them instead and folds the feature into adhoc-flow.md. The decision to delete vs. update is reasonable but should be documented.
• Test coverage: 802 lines of unit tests covering 401 lines of implementation — solid coverage included. ✓
• No npm dependencies: The script uses only Node.js built-ins, no install step needed. ✓
• Plugin sync: All plugin copies (core-claude, core-cursor) are correctly auto-synced via scripts/pre_commit.py. ✓

Suggestions:

• Fix the dangling USE FLOW adhoc-flow-with-plan-manager reference in SKILL.md before merging — either remove the line or replace it with the correct flow name.
• Resolve the TypeScript-vs-JS decision in the PR body and update the description accordingly.
• Remove plans/plan-manager-skills/ from the commit (add to .gitignore or delete from the branch).

Automated triage by Rosetta agent

[YevheniiaLementova]

Agree with a comment from Rosetta Triage Reviewer. The file with workflow flow adhoc-flow-with-plan-manager was deleted