Add AgentGit M1: agent-native git layer over a Forgejo backend

AgentGit is a thin, DID-gated source-collaboration layer over a backend
forge (default Forgejo at git.profullstack.com, BBS-members-only) — not a
new git host. M1 implements the contract and engines:

- forge/adapter.ts: ForgeAdapter interface (only forge-specific surface)
- forge/forgejo.ts: ForgejoAdapter over Forgejo/Gitea REST v1 (injectable
  fetch, typed errors), incl. ensureUser for member provisioning
- access.ts: gateAccess DID membership gate (owner/role/visibility)
- merge-policy.ts: evaluateMergePolicy pure engine (reviews, reputation
  floor, checks, escrow, merge method, agent-merge toggle)
- service.ts: AgentGitService ties gate + policy to the adapter; refuses
  policy-failing merges; provisionMember hook for AgentBBS
- schemas: logicsrc-repo + logicsrc-pull-request, registered in
  @logicsrc/validators with fixtures
- docs/agentgit.md spec; plugin wired into root build (default/disabled)

27 vitest tests pass; full monorepo build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package-lock.json

@@ -1446,6 +1446,10 @@
       "resolved": "apps/commandboard-web",
       "link": true
     },
+    "node_modules/@logicsrc/plugin-agentgit": {
+      "resolved": "plugins/agentgit",
+      "link": true
+    },
     "node_modules/@logicsrc/plugin-c0mpute": {
       "resolved": "plugins/c0mpute",
       "link": true
@@ -6127,7 +6131,8 @@
     },
     "packages/schemas": {
       "name": "@logicsrc/schemas",
-      "version": "0.1.0"
+      "version": "0.1.0",
+      "license": "MIT"
     },
     "packages/sdk": {
       "name": "@logicsrc/sdk",
@@ -6162,6 +6167,16 @@
         "vitest": "^4.0.8"
       }
     },
+    "plugins/agentgit": {
+      "name": "@logicsrc/plugin-agentgit",
+      "version": "0.1.0",
+      "dependencies": {
+        "@logicsrc/plugin-core": "file:../../packages/plugin-core"
+      },
+      "devDependencies": {
+        "vitest": "^4.0.8"
+      }
+    },
     "plugins/c0mpute": {
       "name": "@logicsrc/plugin-c0mpute",
       "version": "0.1.0",