v0.3.0 — Simplify Pebble, eliminate PEBBLE_GUIDE

Removed

• PEBBLE_GUIDE.md eliminated — 360-line guide no longer injected into agent sessions. Behavioral rules moved to agent operating manual (8 rules + work loop). CLI is self-documenting via improved --help output. ~360 fewer lines of injected context per session.
• CODE_GUIDE addons — merged into single unified CODE_GUIDE.md
• ADRs system, meridian-path-guard, save-context command, meridian-wrapper

Changed

• Agents rewritten — code-reviewer (no file writing), docs-researcher (Firecrawl-first), pebble-scaffolder (embedded commands reference)
• Agent operating manual — expanded Pebble section with 8 numbered rules and work loop

Added

• /docs skill — document codebase modules with frontmatter
• Session learner doc awareness — can update any frontmatter'd doc

Fixed

• plan-approval-reminder.py, permission-auto-approver.py, save-injected-files.py import bug, stale docstring

See CHANGELOG.md for full details.