Add interactive triage mode (`debtlens triage`)

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Summary

Add an interactive triage mode (debtlens triage) that walks findings one at a time and lets the user keep, baseline, inline-suppress (with a required reason), or note each one — wiring together baseline + suppression workflows behind a keyboard UI.

Motivation

Adopting DebtLens on an existing repo means processing a backlog of findings. Today that is done by hand across baseline, suppress, and config edits. A guided TUI makes first-run adoption dramatically faster and ensures suppressions get the required auditable reasons.

Proposed behavior

• debtlens triage [paths] runs a scan and presents findings sequentially with evidence + suggestion.
• Per-finding actions: [k]eep, [b]aseline, [s]uppress (prompts for required reason), [o]pen (print issue-creation snippet), [n]ext, [q]uit.
• Batch helpers: apply the same action to all remaining findings of a rule.
• Writes are committed at the end (or incrementally) via existing helpers; supports --dry-run.

Implementation surface

• New src/cli/commands/triage.ts + src/cli/triage.ts (keyboard loop using Node readline; no new heavy TUI dependency unless justified).
• Reuse src/core/baseline.ts, src/cli/suppress.ts / src/core/suppressions.ts, and src/reporters/suppressionAudit.ts.
• Non-interactive guard: refuse to start without a TTY (clear message) and document for CI.
• Tests: scripted input simulation, baseline/suppress side-effects, dry-run.

Acceptance criteria

• Triage applies keep/baseline/suppress actions correctly with required reasons enforced for suppress.
• Batch-by-rule action works.
• --dry-run makes no writes; refuses to run without a TTY.
• Docs + CHANGELOG updated.
• npm run test:all passes.

Difficulty: medium.