chore(agent): commit the machine tier and the doctrine text the checkout was already running

Landing blocker for #61 and #63: the deployment checkout is 12 commits behind and
`merge --ff-only` refuses while tracked paths are dirty. Discard is not available here
(workspace policy: no `checkout`/`stash` on shared state), so the dirt is committed.

- `agent/APPEND_SYSTEM.md`: the point-of-use / one-work-log / PR-link doctrine, already
  byte-identical to `origin/main` (`cmp` against the trunk blob: no difference). No new
  prose — the commit exists so the trunk merge can proceed.
- `agent/config.yml` and `agent/managed-skills/**`: the machine-live tier the heartbeat
  owns (AGENTS.md § Live-sync tiers).

`ALLOW_SECRETS=1` was used, deliberately and after auditing the staged diff by hand: the
only credential-shaped strings in it are two copies of `AKIA0000000000000EXAMPLE` — the
inert all-zero AWS example id — and they appear inside the two skill pages that teach
that exact placeholder shape. This checkout is still running the pre-#61 hook; the merged
gate (value-scoped placeholder filter, `71601f7`) exempts this value, so the refusal
dies with this landing. No `--no-verify` was used: the gate ran and its verdict is
recorded here.

Refs #61

agent/memories/sharpshooter/wt-20261020-125416-6d1fc1f-3cjcsma2m7gk5/architecture.md

@@ -0,0 +1,4 @@
+## Admin Side
+- Endpoints reside on the admin side
+- Loki is reachable
+- Ensure that prometheus is not firing off any more alerts

agent/memories/sharpshooter/wt-20261020-125416-6d1fc1f-3cjcsma2m7gk5/product.md

@@ -1,2 +1,5 @@
-## Handoff Location
-- put it at ~/Projects
+## Variables
+- narrator1 = wilwheaton, narrator2 = vaati, narrator3 = dr.kern
+
+## Dashboard
+- Dashboard includes GPU metrics

agent/memories/sharpshooter/wt-20261020-125416-6d1fc1f-3cjcsma2m7gk5/queue/01a15d93-efb8-7108-b94d-4fabb14597ef/00mvhuqb2j-3hgb.json

@@ -0,0 +1 @@
+{"v":1,"kind":"product_decision","statement":"set frank-dragoon's context to 200k","source":"explicit_user","evidence":"set frank-dragoon's context to 200k","friction":{"corrective":false,"regression":false,"subtle":true},"sessionId":"01a15d93-efb8-7108-b94d-4fabb14597ef","ts":1792571403403}

agent/memories/sharpshooter/wt-20261020-125416-6d1fc1f-3cjcsma2m7gk5/state.json

@@ -1,8 +1,8 @@
 {
 	"v": 1,
-	"lastConsolidatedAt": 1792538116812,
+	"lastConsolidatedAt": 1792571361648,
 	"lastResult": {
-		"at": 1792537164207,
+		"at": 1792568906479,
 		"sessions": 1,
 		"deltas": 1,
 		"model": "frank-zealot"