feat(bar): support --port for ccs bar with sticky port persistence

ccs bar always forced the dashboard onto port 3000 (first free of a
hardcoded candidate list), which collides with other local dev servers, and
bar.json was rewritten to 3000 on every launch.

- `ccs bar [launch] --port N` runs the server on exactly N: reuses a live
  server already on N, moves a running server from another port (SIGTERM via
  server.pid, wait for exit), errors clearly when N is busy or the value is
  invalid.
- The chosen port is persisted into launch.json args, so the Swift app
  self-starts the server on the same port.
- Without --port, launch and serve now try the port recorded in bar.json
  first (sticky), so the server keeps coming back on the port the user last
  chose instead of reverting to 3000.
- Bare flags (`ccs bar --port N`) route to the launch subcommand; --port is
  documented in `ccs bar --help`.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/reports/hardening-inventory.json

@@ -1,9 +1,9 @@
 {
   "scope": "src/**/*.{ts,tsx,js,jsx,mjs,cjs}",
   "syncFs": {
-    "totalOccurrences": 2427,
+    "totalOccurrences": 2429,
     "filesAffected": 258,
-    "hotpathOccurrences": 1142,
+    "hotpathOccurrences": 1144,
     "hotpathFilesAffected": 152,
     "topHotpathFiles": [
       {
@@ -579,8 +579,8 @@
     },
     "loggerCoverage": {
       "filesWithCreateLogger": 65,
-      "totalSourceFiles": 759,
-      "coverageRatio": 0.0856,
+      "totalSourceFiles": 760,
+      "coverageRatio": 0.0855,
       "subdomainsWithZeroCreateLogger": [
         "api",
         "bin",
@@ -606,7 +606,7 @@
         },
         {
           "subdomain": "commands",
-          "count": 108,
+          "count": 109,
           "withLogger": 2
         },
         {
@@ -652,8 +652,8 @@
       ]
     },
     "hotpathConsoleErrors": {
-      "totalOccurrences": 571,
-      "exemptOccurrences": 305,
+      "totalOccurrences": 576,
+      "exemptOccurrences": 310,
       "hotpathOccurrences": 266,
       "filesAffected": 82,
       "topFiles": [

docs/reports/hardening-inventory.md

@@ -6,9 +6,9 @@ Scope: `src/**/*.{ts,tsx,js,jsx,mjs,cjs}`
 
 | Metric | Value |
 |---|---:|
-| Sync fs occurrences (all) | 2427 |
+| Sync fs occurrences (all) | 2429 |
 | Sync fs files affected (all) | 258 |
-| Sync fs occurrences (runtime hotpaths) | 1142 |
+| Sync fs occurrences (runtime hotpaths) | 1144 |
 | Sync fs files affected (runtime hotpaths) | 152 |
 | Legacy shim markers | 458 |
 | Legacy shim files affected | 173 |
@@ -58,9 +58,9 @@ Scope: `src/**/*.{ts,tsx,js,jsx,mjs,cjs}`
 |---|---:|
 | typed-error adoption (typed/total throws) | 17.7% (80/452) |
 | typed-error adoption (P4 locked subdomains) | 93.3% (28/30), target 40% |
-| hotpath console.error/warn occurrences | 266 (571 total, 305 CLI-UX exempt) |
+| hotpath console.error/warn occurrences | 266 (576 total, 310 CLI-UX exempt) |
 | hotpath console.error/warn files | 82 |
-| files with createLogger | 65/759 |
+| files with createLogger | 65/760 |
 | subdomains with zero createLogger | 15 (api, bin, channels, cliproxy, cliproxy/accounts, cliproxy/ai-providers, cliproxy/binary, cliproxy/config, cliproxy/management, cliproxy/sync, cliproxy/types, config, dispatcher, shared, types) |
 | files > 400 LOC | 91 |
 | files > 600 LOC | 42 |