Integration branch: React frontend, OpenCode import, configurable model, explicit-date regeneration

[artcashin]

Single branch combining the session's work, for merging everything at once instead of landing four PRs in sequence.

This duplicates work already under review. Every change here is in an existing PR; nothing is unique to this branch. Reviewers wanting granular, independently-mergeable units should use those instead:

PR	Scope
#19	React frontend + Claude Code subagent linkage, plus the CI fix below
#20	OpenCode session import + configurable summary provider
#22	Regenerate a journal entry when its date is named explicitly

Not included: #21 (session-title provider wiring), which remains a draft stacked on #19 and #20.

What's in it

• OpenCode as a session source (opt-in). OpenCode keeps sessions in a single SQLite database rather than one file per session, so an adapter stages them as JSONL for the normal scanner. Enumeration reads OpenCode's database because opencode session list only reports the current directory's project; transcripts come from opencode export, which works from anywhere.
• Configurable summary provider. Summaries can be written by any OpenAI-compatible endpoint instead of Claude Haiku. Absent config, behaviour is unchanged.
• Explicit-date regeneration. A named --date regenerates its entry; --all still skips already-summarized dates, so the cost control from Summarize re-evaluates skipped groups on every run #10 is intact on the hot path.
• CI fix. bunfig.toml scopes Bun's test runner to src/, and CI runs the web suite with vitest. Without this, a bare bun test — which both workflows run — collected React component tests that need a DOM and failed 18 of them.

Why the branch exists

It is the checkout a local launchd job runs from nightly, which needs OpenCode import and explicit-date regeneration together. That is an operational need, not a review unit — hence this PR being an integration convenience rather than the recommended way to review the work.

Testing

224 tests pass, typecheck clean, pre-commit hook green. Every change was written test-first. Exercised end-to-end against a live corpus: 1000+ sessions ingested, 96 OpenCode sessions across 16 projects with 61 subagents correctly flagged, summaries generated by a local Gemma via llama.cpp.

Two merge conflicts were resolved along the way, both keep-both: summarize.test.ts where two branches appended a describe block, and summarize.ts where the titling block met the changed upsertJournalEntry call.

🤖 Generated with Claude Code

[artcashin]

Closing: the work here is already under review as #19, #20, #21 and #22, which are being merged sequentially to preserve their separate history. This branch remains in use locally as the checkout a nightly launchd job runs from; that automation is being submitted separately on its own branch.