umputun / revdiff / 24600877299

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feat: commit-info popup (i hotkey) for git, hg, and jj (#119)

* docs: add commit-info popup implementation plan

captures the design (capability interface, overlay, lazy fetch, i hotkey,
git/hg/jj support) and task breakdown that guided the implementation.
stored under docs/plans/completed since all tasks are done.

* feat(diff): add CommitLog capability for git, hg, and jj

introduces the CommitInfo struct and CommitLogger capability interface,
with implementations for all three VCS renderers.

- git: git log -z --format=... with NUL record separator; ref form
  "" (noop), "X" (X..HEAD), "X..Y" (as-is)
- hg: hg log -r <revset> --template ...; revset form X::., X::Y - X
- jj: jj log --no-graph -T <template> -r <revset>; revset form X..@, X..Y

parser strips raw \x1b bytes from subject/body to neutralize ANSI
injection, caps results at 500 commits per range, and wraps CLI failures
with fmt.Errorf. testdata files cover empty, single, many, no-body, and
tricky (CJK, tabs, ANSI-looking) cases. hg and jj also get e2e smoke
tests exercising real binaries.

* feat(ui): add commit-info popup overlay with i hotkey

adds a read-only pager overlay that shows the commits included in the
current ref-based diff range, triggered by the i hotkey. helps reviewers
read the narrative context of what the changes are supposed to do
without leaving revdiff.

- keymap: ActionCommitInfo bound to i by default, rebindable
- style: StyleKeyCommitInfoBox registered in resolver (accent border
  matches help/annotlist/themeselect)
- overlay: commitInfoOverlay with manual rendering, word wrap via
  ansi.Wrap, scroll via j/k PgDn/PgUp g/G, error and empty states,
  truncated-range indicator; sizing clamped at 90 cols wide
- model: consumer-side commitLogSource interface (moq-generated mock)
  with ModelConfig.CommitLog injection point and CommitsApplicable gate
  computed in main.go from ref + mode flags. lazy fetch on first open,
  session-wide cache, typed-nil guard on the config... (continued)

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