chore: update opencode workflow and local config

.memory/decisions/critic-gate-tmux-shift-enter-fix.md

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+---
+title: critic-gate-tmux-shift-enter-fix
+type: note
+permalink: dotfiles/decisions/critic-gate-tmux-shift-enter-fix
+tags:
+- tmux
+- critic-gate
+- approved
+---
+
+# Critic Gate: tmux Shift+Enter Fix
+
+## Verdict
+- [decision] APPROVED — Plan is minimal, correctly scoped, and non-destructive.
+
+## Rationale
+- Single `bind-key -n S-Enter send-keys "\n"` addition to `~/.tmux.conf`.
+- `extended-keys on` (line 8) and `extkeys` terminal feature (line 9) already present — `S-Enter` will be recognised.
+- No existing conflicting bindings in `.tmux.conf`.
+- Config will load cleanly; standard tmux syntax.
+
+## Assumption Challenges
+- [finding] `S-Enter` key name is valid because extended-keys is already enabled. ✅
+- [finding] `send-keys "\n"` sends LF (0x0A). For TUI apps and multi-line tools, this inserts a newline as intended. For bare shell prompts, LF may still trigger accept-line (same as Enter). No shell-side `bindkey` exists in `.zshrc` to differentiate. This is a known limitation, not a blocker — follow-up zle binding may be needed.
+
+## Files Evaluated
+- `/home/alex/dotfiles/.tmux.conf` (57 lines, all relevant config)
+- `/home/alex/dotfiles/.zshrc` (2 lines, no keybindings)
+
+## Relations
+- gates [[tmux-shift-enter-fix]]