feat: multi-provider support (Claude Code + Codex)

[lroolle]

Summary

• Multi-provider composite backend — Claude Code (/.claude) + Codex (/.codex) sessions merged by project, sorted by activity
• Codex rollout JSONL parser — handles v2 rollout format (session_meta, event_msg, response_item, turn_context, compacted) with call_id deduplication
• Config struct refactor — typed Settings with ProviderConfig (accent colors, display names, enable/disable), SessionFilter with date/provider/model/query matching
• CLI search/filter flags — --provider cc|cx, --after, --before, --model, --sort time|messages on search and sessions commands
• Web filter bar — provider dropdown + client-side filtering on project page
• Brief export — --brief flag strips to conversation-only (human input, agent responses, compactions, delegation conclusions)
• Memory inspection — project page collapsible memory section with lazy-load file viewer (fmt/raw/copy), cross-project /memory page, memory in search results
• Settings page — provider status cards with session counts, ccx config table
• Raw JSONL in web viewer — "raw" toggle now shows the full original JSONL record with all IDs and metadata
• GoReleaser release workflow — replaces manual cross-compile, adds install.sh, updated SKILL.md

Stats

• 255 test functions across 15 test files
• Core coverage: 83.1% (config 79.6%, parser 91.9%, render 79.1%, provider 78.6%, codex 80.0%)
• 41 files changed, +9190 -264

Review findings addressed

• --before off-by-one (ParseBeforeDate advances to next day midnight)
• --provider + --type project dead path (now checks project sessions)
• --sort was no-op (now sorts by EndTime or MessageCount)
• Session.Model not populated in quick parse (extracted from first assistant/turn_context)
• Provider enable/disable was cosmetic (now wired into Default())
• Codex duplicate tool traces (handledCallIDs dedup for response_item vs event_msg)
• recordTimestampValue tracks min/max (handles out-of-order JSONL)
• Date parsing uses time.Local (matches user timezone expectation)
• shell_command/shell normalized to Bash (10k+ legacy tool calls)

Test plan

• go test ./... — 255 tests pass
• ccx sessions --provider=cx --limit=5 — codex-only filter works
• ccx search --provider=cc "auth" — claude-only search works
• ccx sessions --after=2026-04-01 — date filter works
• Web UI: provider dropdown filters session cards client-side
• Web UI: project page memory section shows expandable file cards
• Web UI: /memory page lists all memory files cross-project
• Web UI: search finds memory files by name and content
• Web UI: visual review of provider accent colors and badge positioning

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