Add repo scaffolding for Colorado-Mesh publish

Adds the project metadata and CI/release workflow needed to publish this
repo under Colorado-Mesh/meshcore-bot-firmware.

- LICENSE: MIT with attribution to upstream MeshCore (also MIT)
- README: rewritten with badges, supported boards, install paths (web
  flasher / PlatformIO / esptool), bot command table, layout map,
  development quickstart
- CONTRIBUTING: submodule + patch-queue workflow, what-goes-where,
  patch hygiene rules, PR expectations
- RELEASE: cmesh-bot-vX.Y.Z tag scheme + procedure
- CHANGELOG: Keep-a-Changelog format, seeded with the hop-coordination
  fix and patch-5 utility commands
- Issue templates: bug_report (with bot stats prompt), feature_request,
  config.yml (no blank issues, link to upstream + community)
- Pull request template: layer checklist, verification gates,
  prefs-schema impact prompt
- .github/workflows/firmware-build.yml: keep PR check on representative
  envs (Heltec V3, RAK 4631 USB+BLE), add concurrency cancellation for
  PRs, scope cache key to PIO config hash
- .github/workflows/release.yml: NEW; triggers on cmesh-bot-v* tag or
  manual dispatch, enumerates all 133 *_companion_radio_(usb|ble) envs
  from vendor/MeshCore/variants/, shards across 8 parallel matrix jobs,
  aggregates artifacts into a single draft release
- scripts/verify.sh: respect MESHCORE_SKIP_APPLY_PATCHES like
  build-representative.sh does, so verify works when vendor already has
  patches applied as commits
- .gitignore: add .forge.bak.*/ for forge backup directories

.github/workflows/firmware-build.yml

@@ -7,9 +7,15 @@ on:
       - main
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   representative-build:
+    name: Representative build (Heltec V3, RAK 4631)
     runs-on: ubuntu-latest
+    timeout-minutes: 30
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
@@ -22,7 +28,9 @@ jobs:
           path: |
             ~/.cache/pip
             ~/.platformio/.cache
-          key: ${{ runner.os }}-pio
+          key: ${{ runner.os }}-pio-${{ hashFiles('vendor/MeshCore/platformio.ini', 'vendor/MeshCore/variants/**/platformio.ini') }}
+          restore-keys: |
+            ${{ runner.os }}-pio-
 
       - name: Install Python
         uses: actions/setup-python@v5
@@ -32,7 +40,7 @@ jobs:
       - name: Install PlatformIO
         run: python3 -m pip install --upgrade platformio
 
-      - name: Run host and safety checks
+      - name: Run host tests and safety checks
         run: bash scripts/verify.sh --no-build
 
       - name: Build representative firmware