feat(projects): support custom project monograms

[rynfar]

Project icons can use a chosen one- or two-character monogram while Pylon's automatic title-based fallback stays unchanged. The project settings picker offers this option only when every environment in the group advertises support, so an older server cannot silently store a folder icon instead.

The contract encodes the new variant as the legacy folder-code Lucide wire form with a separate monogramText hint. The server validates grapheme count at the command boundary, and both the event log and project projection round-trip the compatible representation. Web/desktop render the chosen monogram; all six current mobile project-icon callers now pass saved overrides and render chosen monograms and emoji. Mobile still displays a generic icon for arbitrary saved Lucide names because its native symbol set has no dynamic Lucide renderer. Invalid persisted hints fall back to the Lucide icon. The existing Pylon automatic color/monogram behavior is preserved.

Upstream sources reviewed: 438465d6b7dd2e50dd38862a0db1252d2d72ecfc, 6f7aaffe26f0e6ae3d47b0ae512b322f890e0f43, and 7a368fe7c45a45c284f1b064e440a2d696452b07. The optional general Hermes lint-rule expansion 37a8ab2b29dfa33b4e20ad709a9860f0da7b7eb2 is separate. Tracking: #736. The upstream SVG menu alignment source remains a separate visual candidate.

Validation: 120 focused contract/decider/projection/picker tests; scoped contracts, server, web, and mobile typechecks; scoped lint and formatting; diff check. Independent review passed on the exact head. Browser and device appearance are unverified; no UI images are available from this environment's approved scope.

Implemented with GPT-6 Sol via the Pylon Codex harness.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	14.0 KiB	14.0 KiB	−16 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+3 B (+0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−19 B (−0.3%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+11 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−11 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.8 KiB	+22 B (+0.3%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: 7ed3f71 · PR result: bbe77fe · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 115.6 KiB
• Claude decoded thread snapshot: 116.3 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.