feat(lsp): add missing LspCapability enum values

Align LspCapability enum with the spec's 11-capability set
(docs/specification.md lines 20705-20717):

Renamed: TYPE_INFO -> HOVER, SYMBOLS -> DOCUMENT_SYMBOLS,
         FORMAT -> FORMATTING
Added:   DEFINITIONS, SIGNATURE_HELP, WORKSPACE_SYMBOLS

Updated LspToolAdapter._CAPABILITY_TOOL_MAP (11 entries):
- code_actions suffix -> code-actions (hyphen per spec)
- RENAME gets dedicated schema with new_name parameter
- workspace_symbols gets query-based schema

Updated _input_schema_for() with 4 schema categories extracted
to module-level constants: file-only, position-based, rename
(with new_name), and query-based. Added defensive ValueError for
unmapped capabilities. Added additionalProperties: false.

Extended LspClient.initialize() to advertise all 11 capabilities
in the initialize request (hover, definition, references, rename,
codeAction, formatting, signatureHelp, documentSymbol, workspace
symbol).

Fixed _make_runtime_handler() to handle workspace_symbols as
query-only input (no file_path required), resolving the
schema/handler contract mismatch.

Fixed stale references: type_info -> hover, symbols ->
document_symbols in test fixtures, feature files, CLI docstring.

Updated docs/reference/lsp.md and CHANGELOG.md.

Behave tests (38 scenarios): enum completeness, tool spec generation
with structural validation, input schema per category, all 11
stubbed provider keys, negative tests for invalid capability and
defensive ValueError branch.

ISSUES CLOSED: #834

docs/reference/lsp.md

@@ -20,16 +20,19 @@ The registry is available for configuration and validation purposes even in loca
 
 Enum of LSP features that can be exposed as tools:
 
-| Value          | Description                              |
-|----------------|------------------------------------------|
-| `DIAGNOSTICS`  | Retrieve diagnostics (errors/warnings)   |
-| `TYPE_INFO`    | Get type information at a cursor position|
-| `SYMBOLS`      | List document and workspace symbols      |
-| `COMPLETIONS`  | Get code completion suggestions          |
-| `REFERENCES`   | Find all references to a symbol          |
-| `RENAME`       | Rename a symbol across the workspace     |
-| `CODE_ACTIONS` | Retrieve available code actions          |
-| `FORMAT`       | Format a document or selection           |
+| Value              | Description                                     |
+|--------------------|------------------------------------------------|
+| `DIAGNOSTICS`      | Retrieve diagnostics (errors/warnings)          |
+| `HOVER`            | Get type information and documentation          |
+| `COMPLETIONS`      | Get code completion suggestions                 |
+| `DEFINITIONS`      | Go to the definition of a symbol                |
+| `REFERENCES`       | Find all references to a symbol                 |
+| `RENAME`           | Rename a symbol across the workspace            |
+| `CODE_ACTIONS`     | Retrieve available code actions for a range     |
+| `FORMATTING`       | Format a document or selection                  |
+| `SIGNATURE_HELP`   | Get function signature information at a call    |
+| `DOCUMENT_SYMBOLS` | List all symbols in a file                      |
+| `WORKSPACE_SYMBOLS`| Search for symbols across the workspace         |
 
 ### LspServerConfig
 
@@ -101,7 +104,8 @@ languages: ["python"]
 capabilities:
   - diagnostics
   - completions
-  - type_info
+  - hover
+  - definitions
   - references
   - rename
 env: