groundtruth: tighten template-builder-ui against Sent docs snapshot

[sent-dm]

Scope

Grounds the four files in skills/template-builder-ui/ against the v3 docs snapshot at references/_inputs/sent-docs-v3-2026-05-19.md.

template-validation-matrix.md

• Adds the Sent-confirmed component support matrix (Header/Footer/Buttons: WhatsApp + RCS only; SMS = Body only).
• Adds the Sent-confirmed character-limit table (SMS 160/segment, WhatsApp body 1028, header/footer 60; RCS body 1028, header 60).
• Corrects WhatsApp body limit 1024 → 1028.
• Confirms header types TEXT / IMAGE / VIDEO / DOCUMENT.
• Confirms button types QUICK_REPLY / URL / PHONE_NUMBER.
• Confirms categories UTILITY / MARKETING / AUTHENTICATION.
• Softens name+language immutability claim to product-governance language (consistent with SKILL.md).
• Adds "SMS = Body only" callout under the SMS section so the section is internally consistent with the new component matrix.

template-ui-wireflows.md

• Renames the four creation flows to dashboard-exact names: Create from Scratch, Import from Meta, Create From Definition (note capital "From"), Create from Sample.
• Adds dashboard surface (app.sent.dm/dashboard/templates) and the search/filter axes (name, category, description, status) + per-row actions (edit, delete, view analytics).
• Removes PAUSED from the Flow 6 state-transition diagram.
• Notes the 24–48h WhatsApp review SLA per Sent docs.
• Aligns Flow 7's submit endpoint to POST /v3/templates and mentions Idempotency-Key.

template-status-handling.md

• Replaces the PAUSED-as-badge framing with the Sent-confirmed four-state enum, with an explicit "no PAUSED in Sent" callout.
• Adds the Pending-still-sends-SMS rule per Sent docs (template can be sent over SMS while awaiting WhatsApp approval).
• Reframes webhook discovery as the snapshot-confirmed <field>.<event> envelope; flags template-specific event names as not enumerated in the snapshot and points to GET /v3/webhooks/event-types.
• Notes the v3 update endpoint accepts name/language/category and that immutability should be verified against the live OpenAPI.

SKILL.md

• Drops the now-confirmed PAUSED caveat.
• Drops the now-confirmed WhatsApp component-limit caveat (Sent's header 60 / body 1028 / footer 60 are confirmed; mixed-button rules remain external Meta concerns).
• Rewrites the immutability and webhook caveats with snapshot-accurate framing.
• Aligns section 6 creation-path names with the dashboard.

Verification

• bash scripts/validate-skills.sh → exits 0.
• Each touched reference file starts with <!-- Grounded against references/_inputs/sent-docs-v3-2026-05-19.md (sections used: ...) -->.

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