docs: rewrite README and add community templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Something isn't working
+title: "[Bug]: "
+labels: ["bug", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting. Include version and a redacted config if you can (`npx -y tooltrim validate-config`).
+
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect?
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Tooltrim version
+      placeholder: "0.1.2"
+    validations:
+      required: true
+
+  - type: textarea
+    id: config
+    attributes:
+      label: Config (redacted)
+      description: Paste output of `tooltrim validate-config` or a trimmed `tooltrim.config.yaml`
+      render: yaml
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant logs or trace lines
+      description: A few lines from `.tooltrim/trace.ndjson` if helpful

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Contributing guide
+    url: https://github.com/false200/Tooltrim/blob/main/CONTRIBUTING.md
+    about: Setup, style, and how to run tests locally

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new feature or improvement
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does this solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask how something works
+title: "[Question]: "
+labels: ["question"]
+body:
+  - type: textarea
+    id: question
+    attributes:
+      label: Your question
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: MCP client, Node version, transport (stdio/HTTP), etc.

.github/labels.yml

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+# Synced to GitHub via .github/workflows/labels.yml
+- name: bug
+  color: d73a4a
+  description: Something isn't working
+
+- name: enhancement
+  color: a2eeef
+  description: New feature or improvement
+
+- name: documentation
+  color: 0075ca
+  description: Docs, README, or examples
+
+- name: good first issue
+  color: 7057ff
+  description: Good for newcomers
+
+- name: help wanted
+  color: 008672
+  description: Extra attention or skill needed
+
+- name: question
+  color: d876e3
+  description: Question or support request
+
+- name: triage
+  color: fbca04
+  description: Needs maintainer review or reproduction
+
+- name: performance
+  color: f9d0c4
+  description: Speed, memory, or token savings
+
+- name: security
+  color: b60205
+  description: Security-related issue or fix
+
+- name: dependencies
+  color: 0366d6
+  description: Dependency updates
+
+- name: upstream
+  color: c5def5
+  description: Upstream MCP server or SDK behavior
+
+- name: wontfix
+  color: ffffff
+  description: Will not be addressed

.github/pull_request_template.md

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+## Summary
+
+<!-- What does this PR change and why? -->
+
+## Checklist
+
+- [ ] `pnpm typecheck` passes
+- [ ] `pnpm test` passes
+- [ ] Config or README updated if behavior changed
+
+## Related issues
+
+<!-- Fixes #123 (if any) -->

.github/workflows/labels.yml

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+name: Sync labels
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - .github/labels.yml
+  workflow_dispatch:
+
+permissions:
+  issues: write
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: EndBug/label-sync@v2
+        with:
+          config-file: .github/labels.yml
+          delete-other-labels: false