DO NOT REVIEW: MWPW-199041: Add find-replace IO action

[yesil]

Adds the bulk-edit-find Adobe I/O Runtime action — the Find stage of M@S bulk Find & Replace. Given search text, a field scope, and filters, it returns every matching content fragment in a consumer so Studio can list them and the sibling bulk-edit-replace action (MWPW-199042) can act on them.

Two-stage by necessity: the AEM CF Search API cannot scope full-text to one element, so AEM does recall (path + fullText + tags/status, paged by cursor) and the action does precision — a case-(in)sensitive substring match against the scoped field(s) via a data-driven SCOPE_FIELDS map (everywhere, the listed fields, and tags). Backend-only; consumed by the Studio UI in MWPW-191300.

bulk-edit-replace is registered as a 501 shell only; its implementation lands under MWPW-199042.

Resolves https://jira.corp.adobe.com/browse/MWPW-199041
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

• C1. Cover code with Unit Tests (24 tests; find.js 100% stmt/fn/line + replace.js shell)
• C2. Add a Nala test (N/A — backend IO action, no rendered surface; confirm with #fishbags)
• C3. Verify all Checks are green (unit tests)
• C4. PR description contains working Test Page link (N/A — no UI surface yet; tested via unit suite + action endpoint)
• C5. Ready to demo from Test Page
• C.6 Re-read Jira to validate all ACs addressed

Test URLs

Backend IO action — no rendered page. Validated via the studio unit suite (io/studio: npm test).

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Commits

• dc70181 ✅ (latest)
• 1d073ce ✅
• 4605743 ✅
• 1955125 ✅
• 027b081 ✅
• 4144cdc ✅
• ef50cd0 ✅
• 25436b7 ✅
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• 67f911f ✅
• b791c84 ✅
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• 17f4d2c ✅
• 85fa23b ✅

[github-actions]

SNOW Change Request Transaction ID [IO]: 0000019c1eec85a3-13f8a5e2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.44%. Comparing base (692153c) to head (dc70181).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #987      +/-   ##
==========================================
+ Coverage   89.39%   89.44%   +0.04%     
==========================================
  Files         269      271       +2     
  Lines       84202    84399     +197     
==========================================
+ Hits        75275    75491     +216     
+ Misses       8927     8908      -19     

Files with missing lines	Coverage Δ
io/studio/src/bulk-edit/find.js	100.00% <100.00%> (ø)
io/studio/src/bulk-edit/replace.js	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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