chore(agent): phase roadmap from TODO.md — 3 phases (138–140)

.agents/phases/todo/138_markdown_blockquotes/01_blockquote_pass.md

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+# Task 01 — The blockquote pass in the shared renderer
+
+**Phase:** `138_markdown_blockquotes` · **Source:** `TODO.md:3` — "Markdown formatted ">" quotes aren't rendering"
+**Story:** n/a
+
+## Objective
+`renderMarkdown` turns runs of `>`-prefixed lines into `<blockquote class="md-quote">` elements — after the escape + inline step, before the paragraph pass — with fences and tables keeping their precedence and non-quote input byte-identical.
+
+## Work
+1. `frontend/assets/markdown.js` — new pass between the step-2 `text = inline(escapeHtml(text))` and the step-3 paragraph `.map(...)`: split the text on `\n`; group the maximal run of consecutive lines matching `^\s*&gt;+ ?` (the escaped quote marker); strip the `&gt;` run + one optional space from each member (nested `>>`/`>>>` collapses to one level — ASSUMPTION A1); join members with `<br>`; emit `<blockquote class="md-quote">…</blockquote>`. A blank line terminates the group.
+2. `frontend/assets/markdown.js` — extend the step-3 block-element guard from `/^<(h\d|ul|ol|pre|li)/` to `/^<(h\d|ul|ol|pre|li|blockquote)/` so the paragraph pass leaves the block alone (no `<p>` wrap).
+3. `frontend/assets/markdown.js` — update the module docstring: pass order is now fences → tables → escape+inline → **blockquotes** → paragraphs → restore; document the group rule (blank line terminates; nested collapses) and the documented limit (a list/heading line INSIDE a quote renders as plain text — the inline chain ran first; inline code/strong/em work).
+- ASSUMPTION: a `>` inside a code fence is already protected by the step-1 placeholder (no handling needed); a `>` in a table cell is escaped inside the `<td>` markup and restored in step 4 — both are pinned in task 03's behavior checks.
+
+## Testing & Quality
+- Unit: covered by task 03's file (the source pin + the node behavior listed there) — the frontend house pattern is one unit file per feature.
+- Coverage: n/a (frontend) — the suite + the pins are the gate.
+
+## Completion Criteria
+- [ ] node repro: `renderMarkdown("> a\n> b")` → `<blockquote class="md-quote">a<br>b</blockquote>`; `renderMarkdown("> quoted")` no longer emits a literal `&gt;`
+- [ ] a non-quote input (plain paragraph, list, table, fence) renders byte-identical to the pre-task renderer
+- [ ] `uv run pytest` green (the renderer-dependent unit suites unedited); `uv run ruff check .` clean