Update ADR docs to reflect profile message system

[yewreeka]

Updates ADR documentation to reflect the profile message system migration (PRs #529, #552, #556, #562).

Changes

ADR 005 — Full rewrite from "Profile Storage in Conversation Metadata" to "Member Profile System":

• ProfileUpdate and ProfileSnapshot XMTP content types with protobuf schema
• Profile resolution precedence (ProfileUpdate > ProfileSnapshot > appData > none)
• Snapshot triggers (group creation, addMembers, invite acceptance)
• Message-primary reads with gap-fill from appData
• Typed metadata (MetadataValue oneof with string/number/bool)
• JoinRequest content type for carrying profile during invite flow
• MemberKind enum for agent identification
• Encrypted avatar references via EncryptedProfileImageRef
• Migration phases (1-2 complete, 3 future)
• Updated file references to ConvosProfiles/ConvosInvites packages

Cross-reference updates (ADRs 001, 002, 003, 004, 007, 009):

• ADR 001: 8KB limit note — profiles no longer compete for appData space
• ADR 009: Context updated to reference ProfileUpdate as transport for encrypted avatars
• All: ADR 005 reference text updated to new title

Note

Update ADR docs to reflect the profile message system replacing appData-based profile storage

• Rewrites ADR 005 from appData-based profile storage to a message-based system using two new XMTP content types: ProfileUpdate (self-authored) and ProfileSnapshot (bulk, sent on group creation or member join).
• Defines protobuf schemas for the new types, including MemberKind, typed metadata via map<string, MetadataValue>, and EncryptedProfileImageRef for avatars.
• Updates cross-references in ADRs 001–004, 007, and 009 to reflect the new title ('Member Profile System') and clarify that profiles no longer share appData space.
• Documents a three-phase migration: dual-write, message-primary reads, and eventual stop of appData profile writes.

^{Macroscope summarized 754f629.}

[yewreeka]

• Update ADR docs to reflect profile message system #569 👈 (View in Graphite)
• dev

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[claude]

Claude finished @yewreeka's task —— View job

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ADR Documentation Review — Approved ✅

Excellent documentation update reflecting the migration to message-based profiles. The rewrite of ADR 005 and cross-reference updates are comprehensive and accurate.

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Summary

This PR successfully updates ADR documentation to reflect the profile message system migration (PRs #529, #552, #556, #562). The changes are documentation-only with no code quality, security, or performance concerns.

Key Changes:

• ADR 005: Complete rewrite from appData-based to message-based profile system
• Cross-references: Updated ADRs 001, 002, 003, 004, 007, 009 to reference new profile system

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Code Quality — Excellent

Strengths:

• Clear, comprehensive technical documentation
• Well-structured sections with logical flow
• Consistent terminology throughout
• Good use of code examples, tables, and flow diagrams
• Proper cross-referencing between ADRs

Minor Suggestions:

1. ADR 005:93 — Consider adding a note about performance characteristics of scanning 500 messages:

   `ProfileSnapshotBuilder` scans up to 500 messages (descending) to resolve profiles for all current members, using this precedence.

   Suggestion: Add context like "typically completes in <100ms for most conversations"

2. ADR 005:200 — The JoinRequest section feels slightly disconnected. Consider adding a subheading:

   -### 10. Join Request Content Type
   +### 10. Related Content Types
   +
   +#### JoinRequest (`convos.org/join_request` v1.0)

3. ADR 001:180 — Good update, but consider being more specific:

   -- **8KB Metadata Limit:** XMTP appData field constrains amount of metadata (tags, expiration). Profiles were moved to dedicated XMTP messages (see ADR 005), freeing significant appData space.
   +- **8KB Metadata Limit:** XMTP appData field constrains metadata (invite tags, expiration, image encryption keys). Profiles moved to XMTP messages (see ADR 005), freeing ~60-80% of typical appData usage.

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Technical Accuracy — Correct

Protocol Details:

• Protobuf schemas match implementation in ConvosProfiles/Proto/profile_messages.proto
• Profile resolution precedence (ProfileUpdate → ProfileSnapshot → appData → none) is correct
• Migration phases accurately described (1-2 complete, 3 future)
• File paths and references are accurate

Architecture:

• Correctly describes self-authored ProfileUpdate preventing spoofing
• Snapshot triggers (group creation, addMembers, invite acceptance) are accurate
• Gap-fill semantics for backward compatibility properly explained
• MemberKind enum and typed metadata documented correctly

No Technical Issues Found

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Cross-Reference Updates — Consistent

All ADR updates correctly reference the new profile message system:

ADR	Change	Status
001	8KB limit note, updated title reference	✅ Accurate
002	Updated title in cross-reference	✅ Accurate
003	Updated title in cross-reference	✅ Accurate
004	Updated title in cross-reference	✅ Accurate
007	Updated title and context reference	✅ Accurate
009	Expanded context with ProfileUpdate transport detail	✅ Accurate

ADR 009 Enhancement:
The addition of context about ProfileUpdate/ProfileSnapshot is particularly valuable:

Profile avatars are transmitted via ProfileUpdate and ProfileSnapshot messages (see ADR 005) 
as `EncryptedProfileImageRef` references.

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Documentation Quality — High

Clarity:

• Technical concepts explained clearly for implementers
• Good balance of high-level overview and implementation details
• Privacy implications well-documented

Completeness:

• All major aspects covered (write flow, read flow, encryption, migration)
• Related files section is comprehensive and accurate
• Consequences section honestly discusses trade-offs

Consistency:

• Terminology consistent across all ADRs
• Formatting follows established patterns
• Cross-references use consistent naming

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Security Considerations — Appropriate

The documentation correctly describes:

• Self-authored ProfileUpdate preventing impersonation (inbox ID from XMTP envelope)
• AES-256-GCM encryption for avatars with per-image key derivation
• Privacy isolation via per-conversation identities
• Message-level E2E encryption via XMTP

No security documentation concerns.

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Test Coverage — N/A

This is documentation-only. No code tests needed.

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Recommendations

Optional Enhancements:

1. Add a migration timeline in ADR 005 if known:

   ### 12. Migration Strategy
   
   - **Phase 1 (complete, 2026-03)**: Dual-write
   - **Phase 2 (complete, 2026-03)**: Message-primary reads  
   - **Phase 3 (planned Q2 2026)**: Stop appData writes after forced update

2. Consider adding a troubleshooting section in ADR 005 for common scenarios:

   • What happens if ProfileSnapshot building times out?
   • What if appData write fails during dual-write?
   • How to recover if profiles are missing?

3. Add performance characteristics to consequences:

   ### Negative
   - **Message scan overhead**: Building snapshots scans up to 500 messages (~50-100ms typical)

None of these are blockers — the documentation is already comprehensive and accurate.

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Final Assessment

Approved ✅

This PR successfully documents the profile message system migration with:

• ✅ Accurate technical details
• ✅ Consistent cross-references
• ✅ Clear explanation of architecture changes
• ✅ Proper migration path documentation
• ✅ No security or accuracy concerns

The documentation will serve as an excellent reference for understanding the profile system architecture.

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[macroscopeapp]

Approvability

Verdict: Approved

Documentation-only changes updating ADR files to reflect the profile message system architecture. No runtime code is modified - these are purely markdown documentation updates describing how the system now works.

^{You can customize Macroscope's approvability policy. Learn more.}

Dismissing prior approval to re-evaluate 754f629