Use module-qualified imports for storage.memory.semrefindex

[Bernhard Merkle (bmerkle)]

Summary

• semrefindex (memory variant) is overwhelmingly function-oriented (18 functions + 1 class), so per the import style guidelines in Document Python import style guidelines in AGENTS.md #299/AGENTS.md it defaults to module-qualified.
• Converts the remaining low-frequency direct-symbol call sites:
  • knowpro/add_messages.py: collect_action_terms, collect_entity_terms
  • mcp/server.py: TermToSemanticRefIndex
  • storage/memory/provider.py: TermToSemanticRefIndex
• conversation_base.py already used from ..storage.memory import semrefindex + qualified calls for its 4 function usages, so no change was needed there — this PR brings the rest of src/typeagent in line with that existing convention.
• The sqlite variant's own class (SqliteTermToSemanticRefIndex) exports a single class and is left as direct-symbol import — already compliant, no change.
• Scope: src/typeagent only, per Standardize import style (module-qualified vs direct-symbol) across the codebase #298.
• Phase 2 (3/3, final) of the import-consistency cleanup tracked in Standardize import style (module-qualified vs direct-symbol) across the codebase #298. Companion PRs: Use module-qualified imports for storage.memory.reltermsindex #301 (reltermsindex), Use module-qualified imports for storage.memory.propindex #302 (propindex).

Test plan

• make (format, check on 3.12/3.14, test, build) — 0 pyright errors, 737 passed / 12 skipped, wheel builds

[Copilot]

Pull request overview

This PR completes Phase 2 of the import-style standardization effort (#298) by switching remaining low-frequency call sites of the in-memory storage.memory.semrefindex module from direct-symbol imports to module-qualified usage, aligning src/typeagent with the established pattern already used in knowpro/conversation_base.py.

Changes:

• Replace direct function imports (collect_action_terms, collect_entity_terms) with semrefindex.<fn> calls in the add-messages pipeline.
• Replace direct class import (TermToSemanticRefIndex) with semrefindex.TermToSemanticRefIndex in MCP server typing and in-memory storage provider.
• Keep sqlite semrefindex direct-symbol imports unchanged (single-class export, already consistent).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/typeagent/storage/memory/provider.py	Imports semrefindex as a module and qualifies the TermToSemanticRefIndex type/constructor usage.
src/typeagent/mcp/server.py	Switches to module import (semrefindex) and updates the QueryEvalContext type parameter accordingly.
src/typeagent/knowpro/add_messages.py	Switches to module import (semrefindex) and qualifies calls to term-collection helpers.

[Bernhard Merkle (bmerkle)]

robgruen would you mind taking a look at this one when you get a chance? Thanks!