feat(web): declare the remaining context forms on every shipped producer

Four values complete the vocabulary, so the opaque body is reached only by
producers that genuinely promise no shape.

`snapshot` — current state a later snapshot supersedes. system-prompt now
exposes `renderContextSections()`, the named contributions
`renderContextSnapshot()` already joins for the model, so the body attributes
each part to the subsystem that produced it instead of re-splitting joined
prose. The runtime snapshot, time-context, and tmux-context declare it.

`notice` — a one-off account of what just happened, declared by tool-tasks,
goal state changes, tool-goal wrap-up, plan-mode switches, and
repeat-tool-guard. Its `summary` rides the COLLAPSED row: these five are the
majority of shipped producers and none of them needs expanding to be read.
The task summary bounds itself because its inputs are unbounded caller text.

`relay` — a message another agent addressed to this one; both subagent
sources declare it and the body names the sender above what it said.

`recall` — material lifted from another session's log. session-reference
needed no new field: its references already record retained and omitted
counts and the truncation flag, which the body shows first, because recalled
context is bounded on the way in.

`ContextFormed` is now discriminated by `form`, so a producer cannot declare
a shape without the facts that shape is presented from — a notice without its
summary, or a snapshot without its sections, fails to compile.

Only the two hook bridges stay opaque, by design: their content is whatever
an external program printed, so no shape can be promised for it. Unknown
kinds and unreadable records land there too.

packages/guard/repeat-tool-guard/src/index.ts

@@ -200,7 +200,10 @@ export function apply(ctx: Context, config: Config): void {
     const text = count === thresholds[0]
       ? GENTLE_REMINDER
       : detailedReminder(exec.name, count, previewArguments(canonical, argumentsPreviewChars))
-    return createUserMessage({ content: [{ type: 'text', text }], source: PLUGIN_SOURCE })
+    return createUserMessage({
+      content: [{ type: 'text', text }],
+      source: { ...PLUGIN_SOURCE, form: 'notice', summary: `${exec.name} × ${count}` },
+    })
   }
 
   // Observe-and-enrich, never veto: count first (state advances regardless of