sr-ht-dolt-b08 Memory view: surface bd memories kept in the config table Past Stand

`bd remember` stores agent memories in the beads `config` table as ordinary
key/value rows: the key is `kv.memory.<slug>`, the value is the memory text.
Today they are reachable only through the generic table browser, mixed in with
the tracker's tuning knobs (`compact_*`, `issue_prefix`, ...), and every memory
is squeezed into a single table cell — which is unreadable for the multi-line
handoff notes that make up most of them.

Give them their own view, registered the same way Beads and Milestones are: a
separate `View` implementation whose tab appears next to them for any beads DB.

Shape it on web/milestones.go, which is the smallest existing companion view:

- `web/memory.go`: `memoryView` registered from `init()` via `RegisterView`.
  `Name() == "memory"`, `Label() == "Memory"`, `Template() == "memory.html"`.
- `Applies`: the beads fingerprint (reuse `(&beadsView{}).Applies`, as
  milestones does) plus a `config` table carrying `key` and `value` columns.
  `Applies` only sees table shapes, never rows, so a beads DB with no memories
  still gets the tab and renders an empty state — same contract milestones has.
- `Build`: read `config` through `readRowsOptional`, keep rows whose key has the
  `kv.memory.` prefix, strip it for the display slug, sort by slug. Optional
  `?q=` substring filter over slug + text, and `?key=<slug>` for a single-memory
  detail, both parsed from the query values Build already receives.
- Values are stored as written, so they carry both real newlines and literal
  `\n` two-character escapes (agents type them into shell strings). Normalise
  both into paragraphs before rendering rather than dumping one blob.
- `web/templates/memory.html`: same flat todo.sr.ht idiom and inlined
  `<style>` block as milestones.html, with the `viewtabs` partial and
  `"Current" "memory"`.
- Tests next to `web/milestones_test.go`: fingerprint accept/reject, prefix
  filtering (a `compact_batch_size` row must not show up), escape handling,
  filter and detail modes, empty state.

A beads DB shows a Memory tab beside Beads and Milestones; it lists every kv.memory.* config row as a readable, multi-paragraph entry keyed by its slug; non-memory config rows never appear; a DB with no memories renders an empty state instead of a broken tab.

Owns the revision walk (docs/DESIGN.views.md ch.2.1) now that browse.TableHash exists (97e0f8a): add TableHash to web/deps.go BrowseSession, walk the log newest-first skipping commits whose config table hash is unchanged, cap at 500 commits, render 'older than the last 500 commits' when a key does not resolve.
The 'ago' func landed in 6459298 with chrome's unit ladder: it says '2 months ago' where ch.2.2's mockup wants 'written 71 days ago'. For judging staleness days are the informative unit, so this view needs a day-resolution spelling of its own rather than a change to 'ago' (which is shared with the freshness line).