.swamp/datastore-bundles/ leaks into deno lint and deno fmt scans

Summary

deno lint and deno fmt --check at the repo root scan generated bundle files under .swamp/datastore-bundles/, producing thousands of warnings and "not formatted" errors that are unrelated to any tracked source code. This makes both commands unusable as a local or CI pre-flight check without targeting specific directories.

Reproduction

From the repo root with a populated local swamp repo (.swamp/ exists):

$ deno lint
...
Found 4688 problems (95 fixable via --fix)
Checked 3059 files

$ deno fmt --check
...
error: Found 37 not formatted files in 3452 files

All reported problems point at files like .swamp/datastore-bundles/f5b38492/s3.js — these are bundled third-party JavaScript artifacts, not swamp source code.

Root Cause

.gitignore lines 14–25 exclude most .swamp/ subdirectories (.swamp/data/, .swamp/bundles/, .swamp/vault-bundles/, etc.) but .swamp/datastore-bundles/ is NOT in the list. More importantly, even if it were gitignored, deno lint and deno fmt don't honor .gitignore by default — they need explicit exclude entries in deno.json under lint and fmt sections.

Proposed Fix

Add .swamp/ (or specifically .swamp/datastore-bundles/) to the exclude arrays in deno.json under both lint and fmt:

{
  "lint": {
    "exclude": [".swamp/"]
  },
  "fmt": {
    "exclude": [".swamp/"]
  }
}

Also add .swamp/datastore-bundles/ to .gitignore for consistency with the other .swamp/ subdirectories.

Environment

• Discovered while verifying PR #1141 (hono dependency bump). Had to work around by running deno lint src/ scripts/ and deno fmt --check src/ scripts/ explicitly, which both pass clean.
• swamp git sha: 06888df

Workaround

Target specific directories: deno lint src/ scripts/ and deno fmt --check src/ scripts/