docs(thermidor): ADR + annex for first-class SSR support

[fbeaudoincoveo]

https://coveord.atlassian.net/browse/KIT-5803

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[Copilot]

Pull request overview

Adds internal Thermidor architecture documentation (ADR + annex) proposing a per-interface snapshot API to enable first-class SSR and hydration patterns across frameworks, plus a small spellchecker dictionary update to support the new docs.

Changes:

• Introduces ADR-007 describing the proposed SSR snapshot primitives (initialState, getInterfaceSnapshot, restoreInterfaceSnapshot) and a fromSnapshot shorthand concept.
• Adds a detailed annex documenting proposed public types/options and end-to-end SSR lifecycle examples (including composed interfaces and React adapter ergonomics).
• Updates cspell configuration to allow the HTTP header spelling referer.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
packages/thermidor/docs/internal/adr/ADR-007-ssr-snapshot-api.md	New ADR proposing the SSR per-interface snapshot API and migration considerations.
packages/thermidor/docs/internal/adr/ADR-007-annex-ssr-implementation-details.md	Annex with proposed types, implementation sketches, and SSR usage examples (server/client, composed, React adapter).
.cspell.json	Adds referer to the allowed words list for documentation/examples.

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commit: c00d2d6

[github-actions]

🔗 Scratch Orgs ready to test this PR:

• ✅ LWS Enabled: Open Org
• ✅ LWS Disabled: Open Org

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All tests passed and all changes approved!

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