feat(dev-fkeys): add project-aware F4 compile/run dispatcher

I added a new module `modules/dev-fkeys.el` that owns the dev F-key block. F4 prompts via `completing-read` with a candidate set filtered by project type (compiled / interpreted / unknown). C-F4 is the compile-only fast path. M-F4 is clean + rebuild. It runs a heuristic clean command derived from the project markers (go.mod, Cargo.toml, Eask, Makefile, CMakeLists.txt) and chains `projectile-compile-project` on success. S-F4 stays on `recompile` and now lives globally instead of duplicated across prog-general.el and prog-c.el. F6 is bound globally to `projectile-test-project` as a Phase 1 stopgap. Phase 2 replaces it with the polyglot test runner spec'd in todo.org.

Project-type detection runs against the projectile root and falls back to `unknown` when no marker matches. Interpreted markers are checked first so a Python or Node project with a Makefile for tasks classifies as interpreted instead of compiled. Compile + Run sequencing uses a one-shot `compilation-finish-functions` hook that self-removes on first invocation and only fires the follow-up when the status string starts with `finished`.

Cleanup in the same commit:
- Dropped F4/F5/F6 from `prog-general.el`'s prog-mode-hook. They are now global.
- Dropped F6→format bindings from prog-c.el / prog-python.el / prog-shell.el. C-; f was already bound in each, so this is pure removal.
- Dropped the duplicate S-F4 from prog-c.el. The global binding covers it.
- Updated the keybinding header in prog-general.el and the workflow comments in prog-c.el / prog-shell.el.
- Wired `(require 'dev-fkeys)` in init.el alongside coverage-core.

TDD: 73 tests across 11 files, one per helper. Production code is split into small testable internals (`cj/--detect-project-type`, `cj/--f4-candidates`, `cj/--f4-derive-clean-cmd`, `cj/--f4-make-once-hook`, `cj/--f4-dispatch`, `cj/--f4-compile-and-run-impl`, `cj/--f4-clean-rebuild-impl`, `cj/--f4-project-root`) plus three thin interactive wrappers. Smoke tests confirm bindings register on load.

Known limitation: if another `compilation-finish-functions` hook fires between my add-hook and the compile finishing, the chain can fire on the wrong compile. The hook self-removes on first invocation regardless of which compile it sees. Documented in the impl docstring. Acceptable for v1.

Phase 2 will replace F6 with the polyglot test runner (tree-sitter queries for Python/Go/TS, sexp scan for Elisp, buffer-local last-test memory).

1 files changed, 8 insertions, 12 deletions

diff --git a/modules/prog-c.el b/modules/prog-c.el
index d9191bf4..df32b76a 100644
--- a/modules/prog-c.el
+++ b/modules/prog-c.el
@@ -16,12 +16,12 @@
 ;;
 ;; Workflow Example:
 ;;   1. Open a .c file → LSP auto-starts, provides completions
-;;   2. S-<f2> → Compile (auto-detects Makefile/CMake/single file)
-;;   3. <f5> → Quick recompile
-;;   4. S-<f3> → Start GDB with multi-window layout
-;;   5. <f6> or C-c f → Format code with clang-format
-;;   6. M-. → Jump to function definition
-;;   7. C-c l → Access LSP commands (rename, find references, etc.)
+;;   2. F4 → compile + run dispatcher (dev-fkeys.el)
+;;   3. S-F4 → recompile (repeat last)
+;;   4. S-F6 → start GDB
+;;   5. C-; f → format code with clang-format
+;;   6. M-. → jump to function definition
+;;   7. C-c l → LSP commands (rename, find references, etc.)
 
 ;;; Code:
 
@@ -95,7 +95,6 @@
 (use-package clang-format
   :if (executable-find clang-format-path)
   :bind (:map c-mode-base-map
-              ("<f6>" . clang-format-buffer)
               ("C-; f" . clang-format-buffer)))
 
 ;; -------------------------------- Compilation --------------------------------
@@ -135,11 +134,8 @@
 ;; -------------------------------- Keybindings --------------------------------
 
 (defun cj/c-mode-keybindings ()
-  "Set up keybindings for C programming.
-Overrides default prog-mode keybindings with C-specific commands."
-  ;; S-f4: Recompile (override default - C uses this more than projectile-compile)
-  (local-set-key (kbd "S-<f4>") #'recompile)
-
+  "Set up C-specific S-modifier overrides on the dev F-keys.
+S-F4 (recompile) is global, owned by dev-fkeys.el — not duplicated here."
   ;; S-f5: Static analysis placeholder (could add clang-tidy, cppcheck, etc.)
   (local-set-key (kbd "S-<f5>") #'cj/disabled)