[feature] Add /add-dir command to bulk-add a directory to session context

[shreyastelkar]

Problem

There is no command to bulk-add all files from a directory to the agent's context. Users must reference files individually or hope the agent discovers them through exploration. When working with an entire module, data pipeline, or dbt model directory, this is tedious.

Proposed solution

Add an /add-dir slash command:

/add-dir path/to/dir              # add all files in directory
/add-dir models/staging --depth 1 # add files, limit recursion depth
/add-dir src/ --include "*.sql"   # add only matching files

The command should:

1. Recursively enumerate files in the given directory
2. Respect .gitignore and common ignore patterns
3. Add file contents to the agent's context window
4. Report how many files / tokens were added
5. Warn if the addition would exceed context limits

Current workarounds

• Manually referencing files one by one
• Hoping the agent uses glob or grep to discover relevant files
• Using Read tool on individual files

Additional context

• Built-in commands today are: /init, /discover, /review, /feedback, /configure-claude, /configure-codex
• Custom commands can be defined in .altimate-code/commands/ but this is a common enough need to be built-in