feat(gui): Rename gui.py to gui_legacy.py and update references

MainContext.md

@@ -12,7 +12,7 @@ Is a local GUI tool for manually curating and sending context to AI APIs. It agg
 - `uv` - package/env management
 
 **Files:**
-- `gui.py` - main GUI, `App` class, all panels, all callbacks, confirmation dialog, layout persistence, rich comms rendering; `[+ Maximize]` buttons in `ConfirmDialog` and `win_script_output` now pass text directly as `user_data` / read from `self._last_script` / `self._last_output` instance vars instead of `dpg.get_value(tag)` — fixes glitch when word-wrap is ON or dialog is dismissed before viewer opens
+- `gui_legacy.py` - main GUI, `App` class, all panels, all callbacks, confirmation dialog, layout persistence, rich comms rendering; `[+ Maximize]` buttons in `ConfirmDialog` and `win_script_output` now pass text directly as `user_data` / read from `self._last_script` / `self._last_output` instance vars instead of `dpg.get_value(tag)` — fixes glitch when word-wrap is ON or dialog is dismissed before viewer opens
 - `ai_client.py` - unified provider wrapper, model listing, session management, send, tool/function-call loop, comms log, provider error classification, token estimation, and aggressive history truncation
 - `aggregate.py` - reads config, collects files/screenshots/discussion, builds `file_items` with `mtime` for cache optimization, writes numbered `.md` files to `output_dir` using `build_markdown_from_items` to avoid double I/O; `run()` returns `(markdown_str, path, file_items)` tuple; `summary_only=False` by default (full file contents sent, not heuristic summaries)
 - `shell_runner.py` - subprocess wrapper that runs PowerShell scripts sandboxed to `base_dir`, returns stdout/stderr/exit code as a string
@@ -79,7 +79,7 @@ Is a local GUI tool for manually curating and sending context to AI APIs. It agg
 - Both Gemini and Anthropic are configured with a `run_powershell` tool/function declaration
 - When the AI wants to edit or create files it emits a tool call with a `script` string
 - `ai_client` runs a loop (max `MAX_TOOL_ROUNDS = 10`) feeding tool results back until the AI stops calling tools
-- Before any script runs, `gui.py` shows a modal `ConfirmDialog` on the main thread; the background send thread blocks on a `threading.Event` until the user clicks Approve or Reject
+- Before any script runs, `gui_legacy.py` shows a modal `ConfirmDialog` on the main thread; the background send thread blocks on a `threading.Event` until the user clicks Approve or Reject
 - The dialog displays `base_dir`, shows the script in an editable text box (allowing last-second tweaks), and has Approve & Run / Reject buttons
 - On approval the (possibly edited) script is passed to `shell_runner.run_powershell()` which prepends `Set-Location -LiteralPath '<base_dir>'` and runs it via `powershell -NoProfile -NonInteractive -Command`
 - stdout, stderr, and exit code are returned to the AI as the tool result
@@ -107,10 +107,10 @@ Is a local GUI tool for manually curating and sending context to AI APIs. It agg
 - Entry fields: `ts` (HH:MM:SS), `direction` (OUT/IN), `kind`, `provider`, `model`, `payload` (dict)
 - Anthropic responses also include `usage` (input_tokens, output_tokens, cache_creation_input_tokens, cache_read_input_tokens) and `stop_reason` in payload
 - `get_comms_log()` returns a snapshot; `clear_comms_log()` empties it
-- `comms_log_callback` (injected by gui.py) is called from the background thread with each new entry; gui queues entries in `_pending_comms` (lock-protected) and flushes them to the DPG panel each render frame
-- `COMMS_CLAMP_CHARS = 300` in gui.py governs the display cutoff for heavy text fields
+- `comms_log_callback` (injected by gui_legacy.py) is called from the background thread with each new entry; gui queues entries in `_pending_comms` (lock-protected) and flushes them to the DPG panel each render frame
+- `COMMS_CLAMP_CHARS = 300` in gui_legacy.py governs the display cutoff for heavy text fields
 
-**Comms History panel — rich structured rendering (gui.py):**
+**Comms History panel — rich structured rendering (gui_legacy.py):**
 
 Rather than showing raw JSON, each comms entry is rendered using a kind-specific renderer function. Unknown kinds fall back to a generic key/value layout.
 
@@ -195,10 +195,10 @@ Entry layout: index + timestamp + direction + kind + provider/model header row,
 - Comms log: MCP tool calls log `OUT/tool_call` with `{"name": ..., "args": {...}}` and `IN/tool_result` with `{"name": ..., "output": ...}`; rendered in the Comms History panel via `_render_payload_tool_call` (shows each arg key/value) and `_render_payload_tool_result` (shows output)
 
 **Known extension points:**
-- Add more providers by adding a section to `credentials.toml`, a `_list_*` and `_send_*` function in `ai_client.py`, and the provider name to the `PROVIDERS` list in `gui.py`
+- Add more providers by adding a section to `credentials.toml`, a `_list_*` and `_send_*` function in `ai_client.py`, and the provider name to the `PROVIDERS` list in `gui_legacy.py`
 - Discussion history excerpts could be individually toggleable for inclusion in the generated md
 - `MAX_TOOL_ROUNDS` in `ai_client.py` caps agentic loops at 10 rounds; adjustable
-- `COMMS_CLAMP_CHARS` in `gui.py` controls the character threshold for clamping heavy payload fields in the Comms History panel
+- `COMMS_CLAMP_CHARS` in gui_legacy.py controls the character threshold for clamping heavy payload fields in the Comms History panel
 - Additional project metadata (description, tags, created date) could be added to `[project]` in the per-project toml
 
 ### Gemini Context Management
@@ -222,7 +222,7 @@ Entry layout: index + timestamp + direction + kind + provider/model header row,
 
 
 ## Recent Changes (Text Viewer Maximization)
-- **Global Text Viewer (gui.py)**: Added a dedicated, large popup window (win_text_viewer) to allow reading and scrolling through large, dense text blocks without feeling cramped.
+- **Global Text Viewer (gui_legacy.py)**: Added a dedicated, large popup window (win_text_viewer) to allow reading and scrolling through large, dense text blocks without feeling cramped.
 - **Comms History**: Every multi-line text field in the comms log now has a [+] button next to its label that opens the text in the Global Text Viewer.
 - **Tool Log History**: Added [+ Script] and [+ Output] buttons next to each logged tool call to easily maximize and read the full executed scripts and raw tool outputs.
 - **Last Script Output Popup**: Expanded the default size of the popup (now 800x600) and gave the input script panel more vertical space to prevent it from feeling 'scrunched'. Added [+ Maximize] buttons for both the script and the output sections to inspect them in full detail.
@@ -266,10 +266,10 @@ Documentation has been completely rewritten matching the strict, structural form
 ### aggregate.py — run() double-I/O elimination
 - `run()` now calls `build_file_items()` once, then passes the result to `build_markdown_from_items()` instead of calling `build_files_section()` separately. This avoids reading every file twice per send.
 - `build_markdown_from_items()` accepts a `summary_only` flag (default `False`); when `False` it inlines full file content; when `True` it delegates to `summarize.build_summary_markdown()` for compact structural summaries.
-- `run()` returns a 3-tuple `(markdown_str, output_path, file_items)` — the `file_items` list is passed through to `gui.py` as `self.last_file_items` for dynamic context refresh after tool calls.
+- `run()` returns a 3-tuple `(markdown_str, output_path, file_items)` — the `file_items` list is passed through to `gui_legacy.py` as `self.last_file_items` for dynamic context refresh after tool calls.
 
 
-## Updates (2026-02-22 — gui.py [+ Maximize] bug fix)
+## Updates (2026-02-22 — gui_legacy.py [+ Maximize] bug fix)
 
 ### Problem
 Three `[+ Maximize]` buttons were reading their text content via `dpg.get_value(tag)` at click time: