Include ToolsOverride in middleware population and allow empty tools filter

[JAORMX]

Summary

This change ensures PopulateMiddlewareConfigs passes both tools filter and tool overrides to the ToolFilter and ToolCallFilter middlewares. Middlewares are now applied when either a tools filter or overrides are provided (supports overrides-only).

Motivation

The proxyrunner path relies on PopulateMiddlewareConfigs (backward-compat bridge). Previously it only applied the tools filter and ignored tool overrides, causing proxyrunner to miss overrides that thv run supports. This brings parity so proxyrunner behaves like thv run for tool filtering/overrides.

Change details

• Update pkg/runner/middleware.go to:
  • Convert runner.ToolOverride to mcp.ToolOverride and include it in ToolFilter middleware params.
  • Apply ToolFilter and ToolCallFilter middleware when either a tools filter or overrides are present.

Verification

• Executed tests in the dev container: go test ./pkg/... ./cmd/thv-proxyrunner/... — all passing.
• No API or schema changes; only middleware population logic adjusted.

Impact

• Overrides now function even when no tools filter is specified.
• No behavioral change when neither tools filter nor overrides are provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.60%. Comparing base (736602f) to head (1b210e9).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/runner/middleware.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1889      +/-   ##
==========================================
- Coverage   45.61%   45.60%   -0.02%     
==========================================
  Files         203      203              
  Lines       25923    25931       +8     
==========================================
  Hits        11825    11825              
- Misses      13189    13197       +8     
  Partials      909      909              

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[coveralls]

coverage: 42.875% (-0.01%) from 42.885%
when pulling 1b210e9 on fix/proxyrunner-tools-override-middleware
into 736602f on main.