Add forkmind plugin — local-first LLM branching & debugging

[Medhovarsh]

Adds ForkMind to the marketplace.

ForkMind treats AI context windows like a Git repo: it captures every LLM call into a local .forkmind/ directory, visualizes the conversation as a DAG, and lets you branch alternative prompts/models from any historical turn. Free & local via Ollama, works with any OpenAI-compatible API, and ships an MCP server so agents can query their own history.

What this PR adds

• plugins/forkmind/ — vendored plugin (.claude-plugin/plugin.json, skills/, commands/, agents/, README)
• one entry in .claude-plugin/marketplace.json (category: Development Engineering)

The plugin bundles

• forkmind skill — debug/compare/branch/regression
• /forkmind command
• forkmind-debugger agent — isolated model/prompt compares
• MCP server, auto-wired (npx … forkmind mcp)

Links

• Source: https://github.com/Medhovarsh/forkmind
• Homepage: https://medhovarsh.github.io/forkmind/
• MIT licensed · CI green · standalone marketplace also at Medhovarsh/forkmind

[Copilot]

Pull request overview

Adds the ForkMind plugin to this repository’s Claude Code plugin marketplace, including a skill, slash command, subagent, and plugin manifest wiring for its MCP server.

Changes:

• Added the ForkMind plugin package under plugins/forkmind/ (skill, command, agent, README, plugin manifest).
• Registered ForkMind in .claude-plugin/marketplace.json under Development Engineering.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
plugins/forkmind/skills/forkmind/SKILL.md	Adds the ForkMind skill definition and usage docs (run instructions, core workflows, MCP config).
plugins/forkmind/README.md	Provides a short plugin overview and pointers to upstream docs/homepage.
plugins/forkmind/commands/forkmind.md	Adds the /forkmind command wrapper guidance mapping arguments to skill usage.
plugins/forkmind/agents/forkmind-debugger.md	Adds a forkmind-debugger subagent spec for isolated comparisons/regression checks.
plugins/forkmind/.claude-plugin/plugin.json	Defines the plugin manifest and MCP server launch configuration.
.claude-plugin/marketplace.json	Registers the new forkmind marketplace entry pointing at ./plugins/forkmind.

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[dudley02]

Content validation passed, but this PR now conflicts with the updated main branch. Please rebase/update the branch and preserve the current README/marketplace entries; it can be merged after the conflict is resolved.

[Medhovarsh]

@dudley02 Conflict resolved — branch rebased onto latest main and force-pushed. PR shows MERGEABLE / CLEAN now.

.claude-plugin/marketplace.json: the conflict was my forkmind entry landing on the same array tail as the newly-merged stratarts and screenshot-janitor entries. All three are preserved; forkmind is appended last. Validated after resolution — file parses as JSON, 124 plugin entries, no duplicate names, nothing removed from main.

README.md: added the missing forkmind line under ### Development Engineering (alphabetical slot). Existing entries untouched.

Also addressed the Copilot review comments:

• Added -y to the npx github:medhovarsh/forkmind start examples in SKILL.md, commands/forkmind.md, and agents/forkmind-debugger.md so they are non-interactive and consistent with the MCP config.
• Changed agent frontmatter to the repo convention: tools: Read, Bash, Glob, Grep (was a YAML inline array).
• Removed the inaccurate parenthetical claiming this repo already gitignores .forkmind/.

The diff against main is purely additive (+205 lines across 7 files). Ready to merge whenever you are.
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