feat(cli): describe formatters for the agentic-teams resources

Closes 167. The five new resources fell through to the generic key-value dump,
against the project rule that describe shows clean sections and tables. More to
the point, two things built earlier had no way to reach a human at all: the
roadmap endpoint had no client, and the Epic reconciliation was only visible as
raw JSON.

`describe epic` puts the delivery mismatch directly under the completeness
percentage it contradicts, because reading either one alone is the bug. Rendered
against a live mcpd:

    Completeness:  [....................] 0%  (0/3)
    ...
    Delivery:      MISMATCH between what is claimed and what shipped
      Tasks:                1 merged, 0 outstanding, 0 cancelled
      Delivered, not claimed:
        - wheels  (1 merged, 0 outstanding)
      No roadmap node owns it:
        - engine, feel

plus the criteria checklist, accepted tradeoffs, and the roadmap with per-node
completeness and READY flags.

`describe task` derives the gates a task still owes from its risk and recorded
verdicts ("awaiting security_review, sre_review" vs "all passed"), and shows the
legal next transitions, PR linkage, verdicts and full history — so the answer to
"why won't this move" is on screen rather than requiring a failed attempt.

`describe repo` / `describe gitprovider` show the credential REFERENCE only.
The resolved value exists solely on the session-provision path and must never
reach a describe.

The roadmap, verdict and event fetches are all best-effort: an older mcpd 404s
and the resource still renders, rather than the whole describe failing over an
enrichment.

One bug found by looking at the output rather than the types: the Git section
opened on `!== undefined`, but JSON hands back null, so every task without a PR
printed an empty `Git:` header.

Local: build clean, workspace 2557 passed, lint unchanged at 794 errors.
Verified live against a local mcpd for epic, epictask and task.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4wNHWf7xSwnZCWpJcyv9p

.taskmaster/tasks/tasks.json

@@ -3315,9 +3315,9 @@
         "dependencies": [
           "136"
         ],
-        "status": "pending",
+        "status": "done",
         "subtasks": [],
-        "updatedAt": "2026-08-09T19:36:34.052Z"
+        "updatedAt": "2026-08-10T11:11:23.911Z"
       },
       {
         "id": "168",
@@ -3461,9 +3461,9 @@
     ],
     "metadata": {
       "version": "1.0.0",
-      "lastModified": "2026-08-09T22:36:53.472Z",
+      "lastModified": "2026-08-10T11:11:23.912Z",
       "taskCount": 177,
-      "completedCount": 133,
+      "completedCount": 134,
       "tags": [
         "master"
       ]