* feat: implement layered prompt system for agent sessions
Replace hardcoded spawn prompts with a 3-layer composition system:
- Layer 1: BASE_AGENT_PROMPT constant with session lifecycle, git workflow, PR handling
- Layer 2: Config-derived context (project, repo, tracker, issue details via generatePrompt())
- Layer 3: User-customizable rules via agentRules (inline) and agentRulesFile (path)
The session-manager path fetches issue context from the tracker plugin and passes
the composed prompt via AgentLaunchConfig.prompt. The CLI spawn path delivers it
via tmux send-keys to keep agents interactive for follow-up messages.
Returns null when nothing to compose (no issue, no rules), preserving backward
compatibility for bare launches.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix: use tmuxSendKeys for multi-line prompt delivery in CLI spawn
The buildPrompt() output contains newlines which tmux send-keys -l treats
as Enter keypresses, splitting the prompt into separate submissions. Use
the core tmuxSendKeys() helper which handles multi-line text via
load-buffer/paste-buffer.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* fix: update spawn test to verify tmuxSendKeys usage
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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