feat(git-plugin): add complete git workflow automation suite

## Why
The git plugin only covered a partial slice of common git workflows.
This adds the remaining skill set (branches, commits, history, remotes,
submodules, workflow, worktrees) plus a git-orchestrate agent so the
plugin can handle end-to-end git automation instead of a handful of
commands.

## Implementation Notes
Each new skill was validated against its research docs and org
conventions after initial authoring, which surfaced hallucinated
version pins, factual errors, and completeness gaps that were
corrected in the same pass rather than left for follow-up.

## Impact
Bumps the git plugin to 1.3.0.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
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---
topic: git-log-format
source_keys:
- git-scm-log-docs
- git-scm-diff-docs
---
## Named Format Presets (`--format` / `--pretty`)
| Name | Output |
|---|---|
| `oneline` | `<hash> <title>` |
| `short` | hash, author, title |
| `medium` | hash, author, date, full message (default) |
| `full` | adds committer |
| `fuller` | separate author/committer dates |
| `reference` | `<abbrev> (<title>, <date>)` — for use in commit messages |
| `email` | RFC 2822 email format |
| `raw` | full object as stored in the object database |
| `format:<str>` | custom template with placeholders |
## Custom Format Placeholders
**Commit identity:**
| Placeholder | Meaning |
|---|---|
| `%H` | full commit hash |
| `%h` | abbreviated commit hash |
| `%T` | tree hash |
| `%t` | abbreviated tree hash |
| `%P` | full parent hashes |
| `%p` | abbreviated parent hashes |
**Author:**
| Placeholder | Meaning |
|---|---|
| `%an` | author name |
| `%aN` | author name (mailmap-resolved) |
| `%ae` | author email |
| `%aE` | author email (mailmap-resolved) |
| `%ad` | author date (respects `--date=`) |
| `%ar` | author date, relative |
| `%at` | author date, UNIX timestamp |
| `%ai` | author date, ISO 8601-like |
| `%aI` | author date, strict ISO 8601 |
| `%as` | author date, short (YYYY-MM-DD) |
**Committer:**
| Placeholder | Meaning |
|---|---|
| `%cn` | committer name |
| `%ce` | committer email |
| `%cd` | committer date (respects `--date=`) |
| `%cr` | committer date, relative |
| `%ct` | committer date, UNIX timestamp |
| `%ci` | committer date, ISO 8601-like |
| `%cs` | committer date, short |
**Message:**
| Placeholder | Meaning |
|---|---|
| `%s` | subject (first line) |
| `%f` | sanitized subject (filename-safe) |
| `%b` | body (everything after blank line following subject) |
| `%B` | raw body (subject + body) |
| `%N` | commit notes |
**Refs and decorations:**
| Placeholder | Meaning |
|---|---|
| `%d` | ref names (like `--decorate`) |
| `%D` | ref names without surrounding parentheses |
| `%S` | ref name by which commit was reached (requires `--source`) |
| `%(decorate[:opts])` | custom decorated refs; options: `prefix=`, `suffix=`, `separator=`, `pointer=`, `tag=` |
| `%(describe[:opts])` | like `git describe`; options: `tags=`, `abbrev=`, `match=`, `exclude=` |
**GPG signature:**
| Placeholder | Meaning |
|---|---|
| `%G?` | status: `G`=good, `B`=bad, `U`=unknown, `X`=expired, `R`=revoked, `N`=no signature |
| `%GS` | signer name |
| `%GK` | signing key ID |
**Trailers:**
```
%(trailers[:key=<k>][,only][,separator=<s>][,unfold][,keyonly][,valueonly])
```
**Formatting / color:**
| Placeholder | Meaning |
|---|---|
| `%n` | newline |
| `%%` | literal `%` |
| `%Cred` / `%Cgreen` / `%Cblue` / `%Creset` | terminal colors |
| `%C(<spec>)` | color per git-config spec |
| `%<(<n>[,trunc])` | right-pad field to width n |
| `%>(<n>)` | left-pad to width |
**Reflog** (requires `-g` / `--walk-reflogs`):
| Placeholder | Meaning |
|---|---|
| `%gD` | reflog selector (e.g. `refs/stash@{1}`) |
| `%gd` | shortened reflog selector |
| `%gs` | reflog subject |
## Pickaxe Search: -S and -G
**`-S<string>`** — finds commits where the **count** of `<string>` changed (i.e. the string was added or removed net). Does not match commits where the string merely appears in a diff hunk without a count change.
```bash
git log -S"my_function"
git log -S"my_function" --pickaxe-regex # treat as POSIX ERE
git log -S"my_function" --pickaxe-all # show all files in matching changesets
```
**`-G<regex>`** — finds commits where any added or removed **line** in the patch matches `<regex>`. Broader than `-S`: matches whenever the pattern appears in diff text regardless of count.
```bash
git log -G"frotz\(nitfol"
```
**Critical distinction:** given a diff that removes one occurrence of `foo` and adds one occurrence of `foo` (net change = 0):
- `-S"foo"` — does **not** match (count unchanged)
- `-G"foo"` — **matches** (pattern appears in patch text)
Binary files are searched by `-S`; ignored by `-G` unless `--text` is supplied.
## --diff-filter (full table)
Selects commits (in `git log`) or files (in `git diff`) by change type:
| Letter | Meaning |
|---|---|
| `A` | Added |
| `C` | Copied |
| `D` | Deleted |
| `M` | Modified |
| `R` | Renamed |
| `T` | Type changed (regular file ↔ symlink ↔ submodule) |
| `U` | Unmerged (conflict) |
| `X` | Unknown (indicates a git bug) |
| `B` | Pairing broken |
Lowercase letters **exclude** that type:
```bash
git log --diff-filter=ad # exclude added and deleted files
git log --diff-filter=M # only show commits with modified files
```
`C` and `R` only appear when copy/rename detection is enabled (`-C`, `-M` flags or `diff.renames` config).
## -L — Line Range History (full syntax)
Traces the evolution of a specific range of lines or a named function through commits. Implies `--patch`.
```bash
git log -L 10,20:file.txt
git log -L /start_pattern/,/end_pattern/:file.txt
git log -L :myfunction:src/app.c
git log -L /init/,+15:config.py # 15 lines after first match of /init/
```
Range formats:
| Format | Meaning |
|---|---|
| `<n>` | Absolute line number (1-based) |
| `/<regex>/` | First line matching regex from previous range end |
| `^/<regex>/` | First line matching regex from file start |
| `+<n>` / `-<n>` | Offset relative to `<start>` (end position only) |
Limitations: incompatible with `--raw`, `--numstat`, `--shortstat`, `--name-only`, `--name-status`, `--check`. Cannot use pathspec limiters alongside `-L`.
## Graph and Ancestry Filters
```bash
git log --first-parent # at merges, follow only first parent (mainline evolution)
git log --merges # only merge commits (≥2 parents); equivalent to --min-parents=2
git log --no-merges # only non-merge commits; equivalent to --max-parents=1
git log --ancestry-path D..M # only commits actually on the path from D to M
git log --min-parents=<n> # include only commits with ≥ n parents
git log --max-parents=<n> # include only commits with ≤ n parents
```
`--ancestry-path` is significant: without it, `D..M` includes all commits reachable from M but not D — including side branches that merged into the path. With it, only commits directly between D and M are shown.
## git diff — Output Control
### --stat
```bash
git diff --stat # diffstat: file names + ± bar
git diff --stat=<width>,<name-width>,<count>
git diff --compact-summary # alongside --stat: shows new/gone, +x/-x (executable), +l (symlink)
git diff --numstat # machine-readable: <added>\t<deleted>\t<path>; - for binary
```
### --name-only / --name-status
```bash
git diff --name-only # only filenames, one per line
git diff --name-status # status letter + filename per line
```
`--name-status` uses the same status letters as `--diff-filter`.
### --word-diff
```bash
git diff --word-diff # inline word-level diff with [-removed-] {+added+} markers
git diff --word-diff=color # color only, no markers
git diff --word-diff=porcelain # machine-readable: +/- prefixed lines, ~ for newlines
git diff --word-diff-regex=<re> # define what counts as a "word"
```
### Whitespace Flags
| Flag | Effect |
|---|---|
| `-b` / `--ignore-space-change` | Treat any run of whitespace as equivalent; ignore trailing whitespace |
| `-w` / `--ignore-all-space` | Ignore all whitespace completely |
| `--ignore-space-at-eol` | Ignore whitespace at end-of-line only |
| `--ignore-blank-lines` | Ignore changes consisting entirely of blank lines |
| `-I<regex>` / `--ignore-matching-lines=<re>` | Ignore changes where all changed lines match regex |