feat(tui): add snapshot test infrastructure + terminal compat matrix (bd-2nfs)

- 6 deterministic snapshot tests at 120x40 with FakeClock frozen at 2026-01-15T12:00:00Z
- Buffer-to-plaintext serializer resolving chars, graphemes, and wide-char continuations
- Golden file management with UPDATE_SNAPSHOTS=1 env var for regeneration
- Snapshot diff output on mismatch for easy debugging
- Tests: dashboard, issue list, issue detail, MR list, search results, empty state
- TERMINAL_COMPAT.md template for manual QA across iTerm2/tmux/Alacritty/kitty/WezTerm

crates/lore-tui/tests/snapshots/dashboard_default.snap

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+Dashboard
+ Entity Counts                           Projects                                Recent Activity
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+ Issues: 15 open / 42                    ● 5m ago infra/platform                 No recent activity
+ MRs: 7 open / 28                        ● 12m ago web/frontend
+ Discussions: 120                        ● 8m ago api/backend
+ Notes: 350 (18% system)                 ● 4m ago tools/scripts
+ Documents: 85
+ Embeddings: 200                         Last sync: succeeded
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crates/lore-tui/tests/snapshots/empty_state.snap

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+Dashboard
+ Entity Counts                           Projects                                Recent Activity
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+ Issues: 0 open / 0                      No projects synced                      No recent activity
+ MRs: 0 open / 0
+ Discussions: 0
+ Notes: 0 (0% system)
+ Documents: 0
+ Embeddings: 0
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crates/lore-tui/tests/snapshots/issue_detail.snap

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+Dashboard > Issues > Issue
+#101 Add retry logic for transient failures
+opened | alice | backend, reliability | -> bob, carol
+Milestone: v2.0 | Due: 2026-02-01
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+## Problem
+
+Transient network failures cause cascading errors in the ingestion pipeline. We need exponential backoff with jitter.
+
+## Approach
+
+1. Wrap HTTP calls in a retry decorator
+2. Use exponential backoff (base 1s, max 30s)
+3. Add jitter to prevent thundering herd
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+Discussions (0)
+ Loading discussions...
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crates/lore-tui/tests/snapshots/issue_list_default.snap

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+Dashboard > Issues
+/ type / to filter
+IID v Title                                        State   Author          Labels                   Project
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+ #101 Add retry logic for transient failures       opened  alice           backend, reliability     infra/platform
+  #55 Dark mode toggle not persisting across sessi opened  bob             ui, bug                  web/frontend
+ #203 Migrate user service to async runtime        closed  carol           backend, refactor        api/backend
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crates/lore-tui/tests/snapshots/mr_list_default.snap

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+Dashboard > Merge Requests
+/ type / to filter
+IID v  Title                                State   Author        Target        Labels               Project
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+   !42 Implement exponential backoff for HT opened  bob           main          backend              infra/platform
+!88 [W WIP: Redesign settings page          opened  alice         main          ui                   web/frontend
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crates/lore-tui/tests/snapshots/search_results.snap

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+Dashboard > Search
+[ FTS ] > Type to search...
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+ No search indexes found.
+ Run: lore generate-docs && lore embed
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