feat(plugin): add SSE monitor for real-time AIDLC events

[ChenNima]

Summary

• Adds a background SSE listener (bin/chorus-sse-monitor.sh) that subscribes to /api/events/notifications and emits formatted stdout lines for 10 AIDLC event types (task assigned, proposal approved/rejected, idea claimed, comments, @mentions, elaboration requested/answered, task verified/reopened).
• Registers the listener via Claude Code's plugin monitors/monitors.json so it auto-starts when the plugin loads on a supported runtime.
• Adds /chorus:monitor skill (skills/monitor/) as a manual invocation fallback.
• Adds enableMonitor userConfig flag + SessionStart tip pointing at the skill.
• Extends test-syntax.sh with a syntax-only check for the new script (Bash 3.2 compat).

Known limitation

Claude Code's Monitor runtime is gated by the build-time feature('MONITOR_TOOL') flag, which is compiled off on Bedrock / Vertex / Foundry builds. On those providers the monitors.json entry won't auto-start. The /chorus:monitor skill route is the manual fallback there.

Changed files

File	Change
public/chorus-plugin/bin/chorus-sse-monitor.sh	New — SSE listener with exponential backoff, 10 event-type router, Bearer auth
public/chorus-plugin/monitors/monitors.json	New — plugin monitor registration
public/chorus-plugin/skills/monitor/SKILL.md	New — /chorus:monitor skill doc
public/chorus-plugin/skills/monitor/package.json	New — skill manifest
public/chorus-plugin/.claude-plugin/plugin.json	Adds enableMonitor userConfig (default: true)
public/chorus-plugin/bin/on-session-start.sh	Injects /chorus:monitor tip when enableMonitor=true
public/chorus-plugin/bin/test-syntax.sh	Adds syntax-only check for the new script

Test plan

• /bin/bash public/chorus-plugin/bin/test-syntax.sh — 15/15 passed on Bash 3.2
• Live SSE connection against localhost Chorus server
• E2E: 4 simulated events → 4 correctly formatted stdout lines
• Verify auto-start on native Anthropic API provider
• Verify manual /chorus:monitor fallback on Bedrock

Generated with Claude Code

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	96.92% (🎯 95%)	2209 / 2279
🔵	Statements	95.84% (🎯 95%)	2399 / 2503
🔵	Functions	95.02% (🎯 93%)	458 / 482
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File Coverage

No changed files found.

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