Verb reference

Six verbs, parsed per turn, executed against existing IPC, depth-capped at 3.

Verb	Behavior
<<read:path>>	Read a file (size-capped; env-shaped paths masked).
<<grep:pattern>>	agent:grep with path-glob filter, regex, size + extension guards.
<<symbol:name>>	Look up a symbol in the SQLite code index.
<<exec:cmd>>	Run an allowlisted, read-oriented command; hard-deny on metacharacters.
<<pw:smoke:url>>	Boot dev server, navigate, screenshot, capture console + DOM probe.
<<pw:steps:url|[steps]>>	Drive a step sequence on the smoke harness.