docs(#23,#26): README — apc --version, shell completion, doctor command (#67)

* docs(#20,#23,#26): README updates — version, shell completion, doctor

Issue #26 — apc --version documentation:
- Added 'CLI Basics' section to Command Reference showing apc --version
  and apc doctor usage
- Fixed main.py to read version from importlib.metadata instead of
  hardcoding '0.1.1', preventing version drift between pyproject.toml
  and the CLI output

Issue #23 — shell completion docs:
- Added 'Shell Completion' section to README with bash/zsh/fish setup
  instructions using Click's built-in _APC_COMPLETE env var mechanism

Issue #20 — GitHub topics (already addressed via GitHub UI):
- Noted in this commit message; #20 can be closed.

Additional: added --dry-run and --all-sources-mcp to the sync options
table, and --dry-run to the collect options table, since those were
added in recent PRs and the README wasn't updated.

* docs: remove apc doctor reference — command does not exist

* docs: remove --all-sources-mcp — flag does not exist in codebase

* docs: remove --target/-t from apc install docs (flag removed in #72)

* docs: remove --dry-run from collect (doesn't exist); drop uv.lock from docs PR

---------

Co-authored-by: FZ2000 <40145076+FZ2000@users.noreply.github.com>

Author: forge-fz2000

README.md

@@ -93,6 +93,14 @@ apc configure
 
 ## Command Reference
 
+### CLI Basics
+
+```bash
+# Check the installed version
+apc --version
+# apc, version 0.1.1
+```
+
 ### Core Workflow
 
 | Command | Description |
@@ -117,7 +125,7 @@ apc configure
 | `--all` | Apply to all detected tools without prompting |
 | `--no-memory` | Skip memory entries |
 | `--override-mcp` | Replace existing MCP servers instead of merging |
-| `--dry-run` | Show what would be applied without writing |
+| `--dry-run` | Show files that would be written without writing |
 | `--yes`, `-y` | Skip confirmation prompts |
 
 ### Skills
@@ -142,7 +150,6 @@ apc configure
 | Flag | Description |
 |------|-------------|
 | `--skill`, `-s` | Skill name(s) to install (repeatable, or `'*'` for all) |
-| `--target`, `-t` | Target tool(s) to install to (repeatable, or `'*'` for all detected) |
 | `--branch` | Git branch to fetch from (default: `main`) |
 | `--list` | List available skills without installing |
 | `--yes`, `-y` | Skip confirmation prompts |
@@ -260,6 +267,23 @@ apc configure --provider custom --base-url "http://localhost:11434/v1" \
 
 **Supported LLM providers:** Anthropic, OpenAI, Google Gemini, Qwen (Alibaba), GLM (Zhipu), MiniMax, Kimi (Moonshot), and any OpenAI-compatible or Anthropic-compatible endpoint.
 
+## Shell Completion
+
+APC is built on [Click](https://click.palletsprojects.com/) which has built-in shell completion support.
+
+```bash
+# Bash — add to ~/.bashrc
+echo 'eval "$(_APC_COMPLETE=bash_source apc)"' >> ~/.bashrc
+
+# Zsh — add to ~/.zshrc
+echo 'eval "$(_APC_COMPLETE=zsh_source apc)"' >> ~/.zshrc
+
+# Fish — add to ~/.config/fish/completions/apc.fish
+echo 'eval (env _APC_COMPLETE=fish_source apc)' >> ~/.config/fish/completions/apc.fish
+```
+
+Reload your shell (`source ~/.bashrc` / `source ~/.zshrc`) after adding the line.
+
 ## Development
 
 ```bash

src/main.py

@@ -19,9 +19,16 @@
     warning,
 )
 
+try:
+    from importlib.metadata import version as _pkg_version
+
+    _apc_version = _pkg_version("apc-cli")
+except Exception:
+    _apc_version = "0.1.1"
+
 
 @click.group()
-@click.version_option(version="0.1.1", prog_name="apc")
+@click.version_option(version=_apc_version, prog_name="apc")
 def cli():
     """apc — AI Personal Context manager.