docs: point two Wall comments at code that still exists

[dormouse-bot]

Two comments in lib/src/components/wall/ point at functions that no longer
exist, so a reader following either pointer finds nothing.

• workspace-boot-plans.ts names unwindAdoption as the caller that unwinds a
  mount before the store prunes its parked plan. Last night's Deliver pane alerts reliably with workspace-specific notification settings #667 folded that
  function into discardArrival, which is the caller today
  (standalone/src/workspace-move.ts).
• lath-wall-engine.ts cites addTerminalPanel twice, once for the
  default-shell priming seed's fresh flag drives and once for the
  autoEdge split. That was a local helper inside the dockview-era Pond.tsx,
  removed in f843b21 (April). Both clauses now describe the live path — the
  Wall's own seed effect, and the null add position — instead of naming a
  symbol.

Comment-only, so there is no regression test: nothing executes differently, and
the defect is that a reader's grep comes back empty. grep -rn 'addTerminalPanel\|unwindAdoption' over the repo returns nothing after this
change.

Local verification was partial: pnpm is not on this runner's PATH, so the
package tests did not run here. The dependency-free repo lints
(spec-lint, loopback-lint, public-docs-lint) pass, and CI covers the
rest. spec-lint does report two pre-existing failures on this runner —
standalone/sidecar/node_modules "path does not exist" from
security-supply-chain.md and standalone.md — which are an artifact of the
uninstalled tree, not of this branch.

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