docs(cr-2026-04-22): add release-blocker issue tracker at docs/issues/

Captures the 12 items from docs/code-review-2026-04-22.md that
must land before v0.1 ships. One markdown file per issue with:
severity, path:line, problem description, acceptance criteria,
fix scope, and dependency graph.

Split by severity:
- 3 CRITICAL: live-session race, migration atomicity, transcript-
  profile FK
- 9 MAJOR: monolith refactor, channel-fatality, capture worker
  join, runtime capabilities, macOS App Nap, decoder error prop,
  LLM prompt preflight, keystore thread-safety, hotkey device
  filter

README.md indexes them with a fix-order dependency graph and a
fish-shell script for bulk-converting to GitHub issues once `gh`
CLI is installed and authed. Deferred step by user decision —
markdown tracker is authoritative until then.

docs/issues/llm-prompt-preflight.md

@@ -0,0 +1,24 @@
+# RB-10 MAJOR: LLM prompts not preflighted against context window
+
+**Severity:** MAJOR
+**Path:** `crates/llm/src/lib.rs:143-166`, `:317-321`
+**Source:** [2026-04-22 code review](../code-review-2026-04-22.md)
+**Labels:** release-blocker, major, llm
+
+## Problem
+
+`generate` tokenises and batches the full prompt at runtime. `context_window_size` hard-caps context at 8192 tokens. Long transcripts (a 30-minute dictation session is easily 4000–6000 tokens after segment joining) reach inference with prompts already bigger than the available context — causing late runtime failure instead of a controlled early-exit path.
+
+## Acceptance
+
+- Before inference begins, the prompt token count is compared against the available context window (minus the expected response budget).
+- Oversized prompts either (a) surface a typed error the caller can handle gracefully, or (b) are truncated with a logged warning — decide during the fix.
+- Regression test: synthesise a transcript whose tokenised form exceeds 8192 tokens, assert the chosen behaviour (early error or truncated input).
+
+## Fix scope
+
+Medium. Tokeniser access is already on the LLM path; the check is cheap. Decision work is in what to do when a prompt is too long (fail hard vs truncate).
+
+## Dependencies
+
+- None — standalone fix.