feat: add direct command activation

[risu729]

Fixes #209.

Summary

• add [direct] config for allowed direct command shims, exact per-command biwa run defaults, install directory, and local-command preference
• add argv0-based direct command dispatch for configured shim names
• expose shell activation as biwa activate --shell <bash|zsh|fish>
• move diagnostics to biwa activate doctor and shim creation to biwa activate install [--force]
• treat direct.default_args as biwa run options, so commands that do not depend on synced files can default to options such as --skip-sync
• resolve unset direct.bin_dir from the platform/XDG data directory while preserving explicit config and env overrides
• regenerate schema, usage, CLI docs, and init snapshots
• add unit and SSH e2e coverage for direct command activation and default-arg sync behavior

Follow-up

• feat(direct): support prefix and regex default args #653 tracks expanding exact direct.default_args keys to prefix and regex matchers.

Verification

• mise run render:schema
• mise run test:update-snapshot
• mise run check:oxfmt
• mise run test
• LINT=true mise run check

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	biwa-docs	db675f0	Commit Preview URL Branch Preview URL	May 19 2026, 01:36 AM

[gemini-code-assist]

Code Review

This pull request introduces "Direct Commands," a feature that allows users to execute remote commands via shell shims without explicitly using the biwa run command. It adds a new activate subcommand to manage these shims and generate shell integration scripts for Bash, Zsh, and Fish. The configuration is expanded with a direct section to define allowed commands and shim behavior. Feedback from the review suggests optimizing performance by avoiding redundant configuration loading and regex recompilation. Additionally, a bug was identified in the regex splitting logic used for shim materialization, which fails to correctly handle escaped pipe characters.

[codecov]

Codecov Report

❌ Patch coverage is 59.78648% with 113 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.91%. Comparing base (7e848bd) to head (db675f0).
⚠️ Report is 279 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cli/activate.rs	56.93%	90 Missing ⚠️
src/config/load.rs	55.55%	8 Missing ⚠️
src/cli/mod.rs	53.84%	6 Missing ⚠️
src/cli/run.rs	81.48%	5 Missing ⚠️
src/config/types.rs	71.42%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #632      +/-   ##
==========================================
+ Coverage   41.28%   48.91%   +7.63%     
==========================================
  Files          16       26      +10     
  Lines         671     2349    +1678     
==========================================
+ Hits          277     1149     +872     
- Misses        394     1200     +806     

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