feat(T2b): sources v0 — read tool + pdf-reader sub-agent

Learner source files, on the teacher's own terms (nothing auto-injects):

- read tool (src/agent/tools/read.ts): pi-read port — path/offset/limit,
  2000-line/50KB truncation with use-offset continuation notices, image
  files (jpg/png/gif/webp/bmp) returned as native image content parts
  (new LhToolImageResult escape hatch in lh-tool.ts). Always-on in both
  the prober and teacher registries (user-decided 2026-09).
- pdf-reader sub-agent (JobKind 'pdf', toggleable, ack-and-steer): triage
  via pdf_info (pdfjs text layer: per-page text/image/math-density),
  targeted pdf_extract, regex pdf_search (hits count as consultation),
  and pdf_render — pages painted by pdfjs onto a canvas shim in headless
  Chrome (the pdfium viewer doesn't paint headless), screenshot fed back
  image-in-the-loop (visual-maker idiom, providerSafePng applied). The
  unread-finish gate bounces a zero-consultation brief once. Teacher gets
  a text brief with page citations only; renders never leave the loop.
- MODELS.pdfReader = qwen/qwen3.8-flash (user override 2026-09-19: the
  look-at-renders workload wants the vision-proven model; catalog listed
  glm-5.3-flash as image-capable but qwen is the known-good daily driver).
- UI: PdfCompleteBadge + PdfBriefCard (steer-card, job-card), dispatch
  card + activity-dock kind entries (type-forced, flagged for UI review).
- Prompts: 'Learner source files' section in teacher/30-jobs.md; read
  line in prober/10-probe-doctrine.md. Doctrine rides tool descriptions
  per the self-contained-tools principle.

src/agent/tools.ts

@@ -11,6 +11,7 @@ import type { JobStore } from "../core/ports.ts";
 import { jobTools, type DemoInput, type ResearchInput, type VisualInput } from "./tools/jobs.ts";
 import { planTools, type PlanToolContext } from "./tools/plan.ts";
 import { probeDoneTool, type ProbeDoneContext } from "./tools/probe.ts";
+import { readTool } from "./tools/read.ts";
 
 export { jobTools };
 export type { ProbeDoneContext } from "./tools/probe.ts";
@@ -80,6 +81,9 @@ export function createProberTools(
 			{
 				quiz: probeQuizTool,
 				ask_user_question: askUserQuestionTool,
+				// read is always-on (user-decided 2026-09): the prober inspects
+				// learner-provided source files while assessing the edge.
+				read: readTool,
 				...done,
 			},
 			enabled,
@@ -164,6 +168,9 @@ export function createTeacherTools(
 		{
 			quiz: teachQuizToolFor(ctx),
 			ask_user_question: askUserQuestionTool,
+			// read is always-on (user-decided 2026-09): the teacher reads
+			// learner-provided sources on its own terms — nothing auto-injects.
+			read: readTool,
 			...planTools(ctx),
 			...jobTools({ chatId: ctx.chatId, jobStore: ctx.jobStore, spawn: ctx.spawn }),
 		},