Tune extraction/scoring rules and add CLI examples to README

[devin-ai-integration]

Summary

Improves summary extraction quality by expanding pattern matching rules and fixing several edge cases where filler text was preserved or the wrong clause was selected. Also updates the README with comprehensive CLI usage examples.

Extraction/scoring improvements:

• Leading filler patterns: Added 11 new patterns to strip common conversational filler ("I just wanted to reach out", "I'm experiencing", "we are facing issues with", "just wanted to let you know", "we noticed that", etc.)
• Root cause patterns: Added 12 new patterns for "not working/rendering/loading/showing/displaying/sending", "times/timing out", "crashes", "broken", "incorrect", "returns empty/404/500", "failing"
• Issue keywords: Added 30+ new terms (crash, broken, webhook, api, email, sso, database, connection, 502/403/500, subscription, etc.)
• Context-only patterns: Added 5 patterns to de-score greetings and sentiment ("hope you're doing well", "we've been using", "I love", etc.)
• Clause splitting on "but": Clauses are now split on "but" in addition to "and", so "I love the product but the export is broken" correctly isolates "the export is broken"
• Causal-tail candidates: When a segment contains "because/since/etc.", the text after the causal word is now scored as a separate candidate, preventing filler heads from winning
• Inline score regex expansion: Now also boosts crash, broken, invalid, incorrect, and "timing/timed out" phrases
• Compact summary improvements: Better stripping of linking verbs after user prefixes ("users are", "our team is/are/was/were/has/have")
• Biome formatting fixes: Applied auto-formatting to pre-existing style issues

Before → After examples:

Input	Before	After
"Hey there! ... I just wanted to reach out because our team is unable to upload files..."	"I just wanted to reach out"	"Unable to upload files larger than 10MB"
"I'm experiencing a critical bug where the app crashes..."	"Experiencing a critical bug where..."	"The app crashes whenever I open the settings page on mobile"
"I wanted to report that our webhook endpoints are returning 502 errors..."	"I wanted to report that our webhook endpoints..."	"Our webhook endpoints are returning 502 errors"
"We are facing issues with the database connection pool. Queries are timing out..."	"We are facing issues with the database connection pool"	"Queries are timing out during peak hours"
"I love the product but the export feature is broken."	"I love the product but the export feature is broken"	"The export feature is broken"

README updates:

• Added flag reference table for --summary, --customer, --platform
• Added 7 example CLI invocations covering all 3 platform presets, noisy inputs, and fallback behavior

Review & Testing Checklist for Human

• Run bun run preview with your own real support messages to verify extraction quality matches expectations
• Verify the new leading filler patterns don't over-strip legitimate content (e.g. messages where "I wanted to report" IS the substantive content)
• Check that the "but" clause splitting doesn't lose important context in edge cases (e.g. "tried X but Y happened" — verify Y is correctly selected over X)

Notes

• All 5 existing tests pass without modification
• Lint, typecheck, and build all pass
• The biome formatting changes (trailing commas, import sorting in cli.ts, etc.) are pre-existing issues auto-fixed by bun run lint:fix

Link to Devin session: https://app.devin.ai/sessions/881ab13a1c2a41db95dc38db66d9a681
Requested by: @warengonzaga

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