Add plugin/hook/skill support, images, @mentions, dashboard, and stability fixes

Builds out locode's Claude Code plugin parity: MCP servers, slash commands,
sub-agents, hooks (12 lifecycle events), and skills, all loadable from a
local path or git URL. Also adds image support (read_file, /import), @-mention
file autocomplete, a /dashboard stats view, /export with an editable filename
prompt, an expanded git tool (reset/stash/merge/rebase/delete_branch), and a
redesigned status bar.

On top of that, a review pass found and fixed 10 correctness/stability bugs:
argument-injection in git reset/merge/rebase (a ref like "--hard" was parsed
as a flag), tool-call image results interleaving with native tool_call_id
messages and breaking OpenAI-compatible message ordering, backgrounded bash
jobs still being silently killed by their original timeout with the kill
masked as a clean exit, a SubagentStart hook's block being ignored, the
sub-agent timeout clock starting before the hook it should exclude, a
template-expansion bug that could re-substitute $1..$9 placeholders,
unbounded background-job output buffers, a missing directory-target fallback
in /export, and image size caps checked after reading the whole file instead
of before.

Session saves and exports now go through a shared atomic
write-then-rename helper so a crash can't leave a truncated file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/config/defaults.ts

@@ -15,3 +15,7 @@ export const DEFAULT_CONTEXT_WINDOW = 8192;
 /** Max tool calls per turn before locode gives up rather than looping forever. 25 gives real
  * multi-file tasks room to breathe; still bounded so a genuinely stuck model fails fast. */
 export const DEFAULT_MAX_ITERATIONS = 25;
+
+/** Fraction of the context window at which locode automatically summarizes the conversation.
+ *  User-configurable via `locode config set autoCompactThreshold`. */
+export const DEFAULT_AUTO_COMPACT_THRESHOLD = 0.85;