feat(cli): add `wm seed` command for automatic TLDR generation

[galligan]

Context

Part of deterministic repo initialization (#91). Orchestrate scan → plan → apply workflow.

Scope

• New wm seed command (or wm init --seed)
• Scan files, harvest docstrings, generate TLDRs, apply via bulk insert
• Dry-run mode by default, --write to apply
• Respect skip_paths, ignore patterns, one-TLDR-per-file rule

Acceptance Criteria

• wm seed <paths> - scan and preview TLDR insertions
• wm seed <paths> --write - apply insertions
• wm seed <paths> --json - output plan as JSON/JSONL
• Respects config ignore paths
• Idempotent - skips files with existing TLDRs
• Help text in registry.ts
• Tests in seed.test.ts

Example Output

$ wm seed src/
Would insert TLDRs in 15 files:
  src/auth.ts:1      → "handles user authentication and JWT tokens"
  src/database.ts:1  → "postgres connection and query builders"
  ...

Run with --write to apply changes.

Dependencies

• feat(core): add bulk insert capability for batch waymark operations #238 (bulk insert)
• feat(grammar): add docstring/header detection for content harvesting #239 (docstring detection)
• feat(core): add safe insertion point calculator for TLDR placement #240 (safe insertion point)

Related

Parent: #91

[linear]

WAY-94