fix(git): compress --stat histogram bars in git log output

[ousamabenyounes]

Problem

rtk git log --stat passed histogram bars (| 127 +++++++++++++++++++++++++) through uncompressed, consuming tokens unnecessarily.

Root cause: RTK injects ---END--- format markers between commits. When --stat is active, git appends stat lines after the marker and before the next commit header. filter_log_output splits on ---END--- and treated the leading stat lines as commit headers, corrupting the output.

Solution

Detect --stat/--numstat/--shortstat flags and switch to a stat-aware block processing mode:

• has_stat_flag() — detects stat flags in args
• split_stat_lines_from_block() — splits stat prefix (leading-space lines) from the next commit header
• compress_stat_line() — file.rs | 127 ++++ → file.rs (127+) / (127-) / (127±)
• compress_stat_summary() — 6 files changed, 705 insertions(+), 2 deletions(-) → 6 files, +705 -2
• compress_stat_block() — compresses a full stat block, attaches it to the correct preceding commit

Output comparison

Before (raw passthrough, 3760 chars):

commit 0800bbe...
Author: ...
Date: ...

    feat(copilot): add Copilot hook support

 .github/copilot-instructions.md | 127 +++++++++++++++++++++++++++++++++++++++
 ...
 6 files changed, 705 insertions(+), 2 deletions(-)

After (73% reduction, 989 chars):

0800bbe feat(copilot): add Copilot hook support (35 minutes ago) <Author>
  Add `rtk hook copilot` command...
  .github/copilot-instructions.md (127+)
  src/hook_cmd.rs (208±)
  src/main.rs (7±)
  6 files, +705 -2

Test plan

• 15 new unit tests: has_stat_flag, compress_stat_line, compress_stat_summary, compress_stat_block, filter_log_output with has_stat=true
• All 996 existing tests pass after rebase onto develop
• cargo fmt --all --check passes
• cargo clippy --all-targets — no new warnings (5 pre-existing in init.rs)
• Manually verified with rtk git log --stat -3 on this repo

Closes #611

Signed-off-by: Ben Younes ousama.ben-younes@pm.me

🤖 Generated with Claude Code

[CLAassistant]

All committers have signed the CLA.

[aeppling]

Hey

We are cleaning up the codebase and improving the project structure for better onboarding. As part of this effort, PR #826 reorganizes src/ from a flat layout into subfolders.

No logic changes — only file moves and import path updates.

What you need to do

Rebase your branch on develop when receiving this comment:

git fetch origin && git rebase origin/develop

Git detects renames automatically. If you get import conflicts, update the paths:

use crate::git;        // now: use crate::cmds::git::git;
use crate::tracking;   // now: use crate::core::tracking;
use crate::config;     // now: use crate::core::config;
use crate::init;       // now: use crate::hooks::init;
use crate::gain;       // now: use crate::analytics::gain;

Need help rebasing? Tag @aeppling

[ousamabenyounes]

Rebased on upstream/develop (includes PR #826 reorganization). Resolved conflicts by merging upstream's multi-line body omission feature with the --stat histogram compression — both sets of changes preserved. All tests pass.