Add approved resurfacing digest routing

[WalksWithASwagger]

Summary

• Keep digest generation report-only by default and require explicit approval for routing.
• Add approved local follow-up queue routing plus local Notion page/task draft routing.
• Add CLI flags and tests for approval, dry-run, missing config, and approved write paths.

Verification

• PYTHON=/Users/kk/Code/spektorAI/venv/bin/python make lint
• PYTHON=/Users/kk/Code/spektorAI/venv/bin/python make test -> 288 passed
• PYTHON=/Users/kk/Code/spektorAI/venv/bin/python make digest
• git diff --check

Closes #51

[github-actions]

Agentic PR Review

Verdict: needs-human

Checks:

• Linked issue via Closes #...: yes
• Issue acceptance criteria found: 4
• PR verification section present: yes
• PR acceptance self-check present: no
• PR self-check covers issue acceptance: no
• Diff within v1 limits: yes
• Missing acceptance coverage:
  • Digest routing remains report-only until an explicit approve action is taken.
  • Approved destinations support at least local follow-up queue and Notion task/page draft paths.
  • Dry-run and missing-config behavior is visible before any outbound write.
  • Tests cover approved write, dry-run, and missing-config paths.

This PR is not blocked from human review, but the agentic gate is not satisfied.