docs(macroplan): split each version into its own page

Move each version's scope checklist and status out of the monolithic
macroplan into a dedicated docs/vX.Y-<slug>.md page; macroplan keeps the
source block, the rollup status, and a one-line summary + link per
version. v0.1 reuses its existing product/technical pages.

Also drop the "Optional column ruler at 80" requirement from v0.6.

docs/v0.6-markdown.md

@@ -0,0 +1,38 @@
+# v0.6 — Markdown affordances
+
+> Part of the [Typoena macro plan](macroplan.md). Requirements and targets:
+> [qfd.md](qfd.md). Load-bearing decisions: [adr.md](adr.md).
+
+**Status:** render affordances done early; the snippet
+engine remains (snippets are net-new scope, added 2026-07-08).
+
+- [x] Heading lines bolded in render (faux-bold double-strike)
+- [x] List continuation on Enter inside `- ` / `1. ` (with empty-item exit)
+- [x] Soft-wrap at word boundaries
+- [ ] **Snippets** — trigger-driven text expansion for Markdown authoring
+      (Zed-inspired, but no completion popup: e-ink's ~630 ms refresh rules out
+      a live filtering menu, and it fights the distraction-free premise). Shape,
+      mirroring the existing `list_marker` insert-transform:
+  - [ ] Tab in Insert mode triggers expansion: if the word immediately before
+        the caret matches a snippet prefix, expand it; otherwise insert spaces
+        as today (`expand_snippet(word) -> Option<(body, stops)>`, alongside
+        `list_marker`).
+  - [ ] A snippet body is literal text plus numbered empty tab stops `$1 … $n`
+        and a final `$0`. There is no placeholder text (`${1:label}`) — the
+        editor has no selection/overtype model, so a placeholder would just be
+        text to delete. There are no dynamic or computed values either (e.g. no
+        `date` — there's no RTC; the wall clock is valid only after Wi-Fi+SNTP,
+        so it'd stamp 1970 on a cold boot).
+  - [ ] After expansion the caret lands on `$1`; Tab advances to the next stop,
+        forward only (no Shift-Tab). Stored stop offsets shift with edits at the
+        caret (all pending stops are always after it). The session auto-aborts
+        on Esc, a mode change, or a motion that leaves the stops.
+  - [ ] On a typing pause (same throttle as the insert cursor / word-count
+        refresh — the panel never repaints per keystroke), if the word before
+        the caret is a snippet prefix, the side panel shows the hint (the target
+        expansion). Quiet while typing; the hint appears on pause.
+  - [ ] The snippet table is hard-coded in the binary to start; a git-syncable
+        file on SD (`/sd/repo/.snippets`) is a later option, deferred while SD
+        is still blocked.
+  - [ ] Starter set: link `[$1]($2)$0`, image `![$1]($2)$0`, fenced code block,
+        etc.