feat(ui): add rain session logger and selector log panel

[bschellenberger2600]

Summary

• add internal/sessionlog JSONL logger with git-fire-compatible structured event fields and subscribe hooks for UI projection
• wire runRainTUIStream to initialize session logger, pass it into selector, and preserve existing TUI-then-CLI handoff to runRainOnRepos
• add selector status strip, toggleable log panel (Shift+L), and text export (e), plus README docs for new controls

Test plan

• go test ./internal/sessionlog -count=1
• go test ./internal/ui -run 'StatusGlyph|RenderLogExport|ToggleLogPanel|RepoSelector' -count=1
• go test ./cmd -run 'runRainTUIStream|RunRain|Root' -count=1
• go test ./...

Made with Cursor

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Note

Medium Risk
Adds new session log file writing and expands TUI behavior/state (status strip, log panel, export), which could affect interactive runs and filesystem permissions/paths, but does not change core git fetch/sync logic.

Overview
Introduces a new internal/sessionlog JSONL session logger (git-fire-compatible LogEntry shape) that writes start/end markers, supports local subscribers, and sanitizes error text.

Wires the --rain streaming TUI (runRainTUIStream → RunRepoSelectorStream) to create/close a session logger and record scan/progress/completion events, and extends the selector UI with a status strip plus a toggleable in-TUI log panel (Shift+L) and log export to ~/.cache/git-rain/exports/ (e). README docs and unit tests are added for the new logging/export behavior.

^{Reviewed by Cursor Bugbot for commit d43d0b6. Bugbot is set up for automated code reviews on this repo. Configure here.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0bf10bd1-ee9b-4ec8-b6db-1d5740cf1f60

📥 Commits

Reviewing files that changed from the base of the PR and between 692d726 and d43d0b6.

📒 Files selected for processing (8)

• README.md
• cmd/root.go
• internal/sessionlog/logger.go
• internal/sessionlog/logger_test.go
• internal/ui/repo_selector.go
• internal/ui/status_log.go
• internal/ui/status_log_test.go
• internal/ui/view_layout.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/tui-status-log-export

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