refactor!: rebrand bterminal to agor (agents-orchestrator)

Rename Cargo crates (bterminal-core→agor-core, bterminal-relay→agor-relay),
env vars (BTERMINAL_*→AGOR_*), config paths (~/.config/agor), CSS custom
properties, plugin API object, package names, and all documentation.

BREAKING CHANGE: config/data paths changed from bterminal to agor.

tests/e2e/README.md

@@ -21,21 +21,21 @@ npm run test:e2e
 SKIP_BUILD=1 npm run test:e2e
 
 # With test isolation (custom data/config dirs)
-BTERMINAL_TEST_DATA_DIR=/tmp/bt-test/data BTERMINAL_TEST_CONFIG_DIR=/tmp/bt-test/config npm run test:e2e
+AGOR_TEST_DATA_DIR=/tmp/bt-test/data AGOR_TEST_CONFIG_DIR=/tmp/bt-test/config npm run test:e2e
 ```
 
 The `wdio.conf.js` handles:
 1. Building the debug binary (`cargo tauri build --debug --no-bundle`) in `onPrepare`
 2. Spawning `tauri-driver` before each session (TCP readiness probe, 10s deadline)
 3. Killing `tauri-driver` after each session
-4. Passing `BTERMINAL_TEST=1` env var to the app for test mode isolation
+4. Passing `AGOR_TEST=1` env var to the app for test mode isolation
 
-## Test Mode (`BTERMINAL_TEST=1`)
+## Test Mode (`AGOR_TEST=1`)
 
-When `BTERMINAL_TEST=1` is set:
+When `AGOR_TEST=1` is set:
 - File watchers (watcher.rs, fs_watcher.rs) are disabled to avoid inotify noise
 - Wake scheduler is disabled (no auto-wake timers)
-- Data/config directories can be overridden via `BTERMINAL_TEST_DATA_DIR` / `BTERMINAL_TEST_CONFIG_DIR`
+- Data/config directories can be overridden via `AGOR_TEST_DATA_DIR` / `AGOR_TEST_CONFIG_DIR`
 
 ## CI setup (headless)
 
@@ -132,7 +132,7 @@ tests/e2e/
 ├── fixtures.ts                       # Test fixture generator (isolated environments)
 ├── results-db.ts                     # JSON test results store
 └── specs/
-    ├── bterminal.test.ts             # Smoke tests (CSS class selectors, 50+ tests)
+    ├── agor.test.ts             # Smoke tests (CSS class selectors, 50+ tests)
     └── agent-scenarios.test.ts       # Phase A scenarios (data-testid selectors, 22 tests)
 ```