feat: add rtk session command for adoption overview

[ousamabenyounes]

Summary

• Adds rtk session command that displays the last 10 Claude Code sessions with RTK adoption metrics
• Reuses ClaudeProvider from discover module — zero JSONL parsing duplication
• Also fixes pre-existing build error: missing truncate import in cargo_cmd.rs

Output example

RTK Session Overview (last 10)
----------------------------------------------------------------------
Session      Date          Cmds   RTK  Adoption           Output
----------------------------------------------------------------------
703dbcb4     Today          190     0        0% .....     101.0K
e5701247     Today          461    14        3% @....     251.2K
----------------------------------------------------------------------
Average adoption: 2%
Tip: Run `rtk discover` to find missed RTK opportunities

Test plan

• 7 unit tests (progress bar rendering, adoption % calculation, edge cases)
• Manual test: cargo run -- session on real Claude Code sessions
• cargo fmt --all && cargo clippy --all-targets clean (no new warnings)
• Smoke test in scripts/test-all.sh

Closes #487

🤖 Generated with Claude Code

[aeppling]

Hello,

I'm checking with maintainers if we want to implement this, but if we do you will need to document this in rtk documentation.

[aeppling]

We want to implement this commands in RTK, however there is some point to be addressed first:

Adoption metric always look very low

• When hooks are installed, Claude sends git status and the hook transparently rewrites it to rtk git status. The
  JSONL logs the original command (git status), not the rewritten one. So hook-based usage shows as 0% adoption.

• When Claude explicitly types rtk commands, it counts, but that's rare.

DOCS

Do not forget document this command !

Thanks for contributing !

[aeppling]

Closed the git -C related PR, just add correct documentation and fix and we will merge this PR for both the "rtk session" command and "git -C " fix

[ousamabenyounes]

Thanks @aeppling! All 3 points addressed:

1. Adoption metric fixed
The hook rewrites git status → rtk git status but JSONL logs the original command. count_rtk_commands now uses classify_command() from the rewrite registry to also detect commands the hook would rewrite. Result: adoption went from ~2% to ~68% on real sessions.

2. Documentation
Added rtk session to README.md.

3. git -C fix
Cherry-picked into this PR (PR #556 can stay closed).

Example output with the fix:

RTK Session Overview (last 10)
----------------------------------------------------------------------
Session      Date          Cmds   RTK  Adoption           Output
----------------------------------------------------------------------
e5701247     Today          508   352       69% @@@..     279.6K
facf2ba6     Today          105    67       64% @@@..      96.7K
----------------------------------------------------------------------
Average adoption: 68%

[aeppling]

Hey !

I retried with your latest fix, indeed it work better ! But got some trouble with chained commands that still display 0% adoption (example , claude running "cd ./your/app/path && rtk ls"

The discover module already handles chained commands. In src/discover/mod.rs:86:

let parts = split_command_chain(&ext_cmd.command);

Could you implement this so our adoption metric always make sense and does not display 0% on chained commands ?

If you could also add a testing for those chained command which is kind of edge case for your adoption metric.

[ousamabenyounes]

Thanks @aeppling! Chained commands are already handled in the latest push.

count_rtk_commands uses split_command_chain() from the discover module to break chains before classification:

let parts = split_command_chain(&c.command);
for part in &parts {
    if part.starts_with("rtk ")
        || matches!(classify_command(part), Classification::Supported { .. })
    { ... }
}

So cd ./your/app/path && rtk ls splits into 2 commands → cd (unsupported) + rtk ls (counted) = 50% adoption for that line.

Tests covering this:

• test_count_chained_commands_split — cd ./path && rtk ls → 2 total, 1 RTK
• test_count_chained_all_supported — git status && git log -5 → 2 total, 2 RTK
• test_count_chained_with_semicolon — echo a ; echo b ; git status → 3 total, 1 RTK
• test_parse_jsonl_chained_command — full JSONL parsing integration test with chained command

[aeppling]

Work well ! Thanks for contributing

Merged will be available in next release