docs: update spectrum-ts documentation for v9.0.0

[photon-action-bot]

Documentation Update: spectrum-ts v9.0.0

This PR updates documentation for spectrum-ts based on the v9.0.0 release.

Release Notes

Breaking Changes

• Space now reserves getMembers, getAvatar, add, remove, and leave. If a custom platform used those names in space.actions, rename them because Spectrum now owns them as universal methods.
• Content now includes addMember, removeMember, and leaveSpace, so exhaustive switch statements over message.content.type may need new cases.

New Features

• Added group membership APIs: addMember(), removeMember(), and leaveSpace(), plus the friendlier space.add(), space.remove(), and space.leave() helpers.
• Added space.getMembers() and space.getAvatar() so apps can read a group roster or fetch the current group icon when the provider supports it.
• iMessage remote/dedicated mode now supports adding members, removing members, leaving groups, reading members, and reading group avatars.
• iMessage group changes from other people now arrive on app.messages as normal inbound messages, including membership changes, renames, and avatar updates. ✨
• Webhook deserialization now understands membership, rename, and avatar content instead of falling back to custom content.

Bug Fixes

• getMembers() now validates provider results and throws a clear error if a provider returns something other than an array.
• Telegram now explicitly reports membership operations as unsupported instead of letting them fall through the generic send path.

Improvement

• Group membership, avatar reads, inbound group events, and nullable message.sender behavior are now documented with iMessage-specific guidance.

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Version: 9.0.0

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🤖 This PR was auto-generated by Claude Code via the update-docs action in buildspace.

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[github-actions]

Resolved merge conflicts with main (the branch was DIRTY/CONFLICTING after #103, #108, #111 landed).

Root cause: main restructured spectrum-ts docs to be sourced from the photon-hq/spectrum-ts repo's docs/ directory at ref: main (git-only), and #111 removed the local: docs-src/spectrum-ts fallback in scripts/sources.json. This deleted the entire docs-src/spectrum-ts/ tree, which this PR had modified — producing 10 modify/delete conflicts (plus the rest of the tree already staged as deletions).

Resolution:

• Content files (docs-src/spectrum-ts/**/*.mdx.vel, nav.json) — accepted main's deletion. Under the new architecture the build no longer reads docs-src/spectrum-ts/; authored prose is pulled from the source repo. The v9.0.0 prose changes (incl. the new content/membership.mdx.vel page) belong in photon-hq/spectrum-ts's docs/ dir and should be landed there instead — they'd be dead files here.
• package.json — kept this PR's bump of spectrum-ts to 9.0.0 (merged cleanly; main didn't touch it). This is the meaningful surviving change: it drives Vellum's type extraction and selects the doc source revision.
• pnpm-lock.yaml — kept this PR's lockfile update to 9.0.0 (@spectrum-ts/*@9.0.0); merged cleanly.
• scripts/sources.json, .github/workflows/{deploy-dist,typecheck-docs}.yml — took main's versions (auto-merged; the git-source switch).

Verification: pnpm install --frozen-lockfile ✅ (spectrum-ts 9.0.0), pnpm lint ✅, pnpm typecheck:docs ✅ (all code blocks type-check and format-check).

⚠️ Note: this PR now effectively only bumps the package to v9.0.0 + lockfile. The doc content updates it contained are no longer applied here and need to go to the spectrum-ts source repo.

[github-actions]

Superseded by #113 which targets a newer version.