MWPW-198143: add mas-author skill for safe M@S authoring via Odin MCP

[yesil]

• SKILL.md: stop rule, allow/deny lists, and guardrail workflows (publish, placeholder+index, safe delete, en_US tags, one-variation-per-locale) for driving the Odin MCP.
• references/content-model.md: M@S content-fragment model IDs, reference fields, path/locale grammar, and variation rules. No code references.

Type install http://mas.adobe.com/docs/mas-author skill in Claude or ChatGPT.

Conversation Thread
You: /mas-author open fragment 597d1655-ab30-4f5d-9ea8-d777edf93249 in studio
Claude: Card model, path is /content/dam/mas/sandbox/en_US/create11111121129, so surface = sandbox.
Here's the M@S Studio link for CC Plans Merch Card: CC Pro: Individuals: apac-cci-q3fy26-promo-ph-th:
https://mas.adobe.com/studio.html#page=fragment-editor&fragmentId=597d1655-ab30-4f5d-9ea8-d777edf93249&path=sandbox

You: create a locale variation for egyprt
Claude: Egypt has two existing M@S locale folders: ar_EG (Arabic) and en_EG (English). Which one should I create the variation for?
You: en_EG (English)
Claude: The parent's variations field is empty, so no en_EG variation exists yet — clear to create.
[Created the fragment, working through a couple of schema/format errors along the way — fields needed to be an array of {name, type, values} objects rather than a plain object, and originalId needed to match the parent's originalId value rather than its own id, to keep it consistent with the en_US source.]
Shell created at /content/dam/mas/sandbox/en_EG/create11111121129 (id c36b05e0-fd15-4f4b-844c-4e3a21d14ffc). Now linking it to the parent's variations field.
Done. The en_EG variation is created and linked:

New fragment: c36b05e0-fd15-4f4b-844c-4e3a21d14ffc at /content/dam/mas/sandbox/en_EG/create11111121129
Shell fields carried over: osi, variant, size, cardName, promoCode, and originalId (matching the en_US parent's original id) — non-translatable structural fields only
Linked to the parent's variations field

Translatable content (title, description, badge, prices, CTAs, etc.) is intentionally left empty — that's MAS Studio's job, not something I should fill in with raw fragment edits. Studio link to open the new variation:
https://mas.adobe.com/studio.html#page=fragment-editor&fragmentId=c36b05e0-fd15-4f4b-844c-4e3a21d14ffc&path=sandbox

You: update tags of en_EG one
Claude: That variation is at en_EG, not en_US — so I can't edit its tags directly.
Tags belong on the en_US default fragment and are inherited by its locale variations, so editing tags on the en_EG copy wouldn't do anything meaningful (and could create drift from the parent). Reading its tags is fine, but writes should happen on the en_US fragment instead.
Want me to update the tags on the en_US parent (597d1655-ab30-4f5d-9ea8-d777edf93249) instead? If so, let me know what changes you want (add/replace/remove which tags).

Resolves https://jira.corp.adobe.com/browse/MWPW-198143
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Please do the steps below before submitting your PR for a code review or QA

• C1. Cover code with Unit Tests
• C2. Add a Nala test (double check with #fishbags if nala test is needed)
• C3. Verify all Checks are green (unit tests, nala tests)
• C4. PR description contains working Test Page link where the feature can be tested
• C5: you are ready to do a demo from Test Page in PR (bonus: write a working demo script that you'll use on Thursday, you can eventually put in your PR)
• C.6 read your Jira one more time to validate that you've addressed all AC's and nothing is missing

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Test URLs:

• Before: https://main--mas--adobecom.aem.live/
• After: https://mwpw-198143--mas--adobecom.aem.live/

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Commits

• 7912a06 ✅ (latest)
• bc54d2a ✅
• 614d53b ✅
• c12b55d ✅
• 6914217 ✅
• 77bcd6f ✅
• 2340668 ✅
• 07104c9 ✅
• b664feb ✅
• 65eac45 ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.09%. Comparing base (690448a) to head (7912a06).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1024      +/-   ##
==========================================
+ Coverage   90.06%   90.09%   +0.03%     
==========================================
  Files         285      285              
  Lines       91196    91196              
==========================================
+ Hits        82136    82167      +31     
+ Misses       9060     9029      -31     

see 13 files with indirect coverage changes

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