Document prompt sessions and concurrency defaults

docs/roadmap/future.md

@@ -53,71 +53,6 @@ not as committed release dates.
   spell, combat, interaction, and scene-description lanes after real-world use.
   Add more complex chunking only in response to demonstrated failures.
 
-## Cross-Cutting LLM Runtime
-
-### Deterministic Prompt Session Identity
-
-- Replace the source-document-ID default for prompt sessions with one
-  predictable, procedurally generated session ID for the complete
-  source-processing workload.
-- Preserve an explicit non-empty `--session-id` as the highest-precedence
-  override. Otherwise, derive the default only from the effective input module
-  identity and the exact raw input bytes.
-- Use a versioned, bounded representation such as
-  `notarius:v1:<sha256(input-module + NUL + raw-input)>`. The exact encoding
-  must fit PromptKit's session length contract and must not embed source
-  content.
-- Keep the derived session stable across runs, pipelines, selected lanes,
-  ordered steps, retries, resume, recomputation, LLM profiles, reasoning
-  overrides, and output, debug, or cache settings.
-- Do not include file-backed references, generated references, reference
-  contents, or the composition of a reference bundle in session derivation.
-  References may change between prompt calls within one pipeline without
-  changing routing affinity.
-- Resolve the authoritative session before checkpoint construction and use the
-  same value for checkpoint runtime identity, every prompt-facing module,
-  PromptKit's direct session field, the compatibility `session_id` prompt
-  variable, run-manifest metadata, and debug metadata.
-- Keep routing identity separate from cache and checkpoint content identity.
-  Exact prompt prefixes, reference contents, model settings, and other
-  generation-affecting inputs must continue to participate in their existing
-  hashes and checkpoint fingerprints even though they do not change the
-  session.
-- Treat the generated value as a provider-visible, stable pseudonymous
-  correlation identifier. Do not introduce an installation-specific HMAC or
-  secret unless a concrete multi-tenant or privacy requirement justifies
-  sacrificing deterministic identity across installations.
-
-### Raise The Default Application-Wide LLM Limit
-
-- Raise the default `concurrency.total_llm` value from 1 to 16 so ordinary
-  single-backend runs can use PromptKit's expected OpenRouter capacity and
-  lower-capacity local backends without an unnecessarily narrower Notarius
-  limit.
-- Keep the Notarius application-wide scheduler mandatory and require
-  `total_llm` to remain a positive integer. Do not make the default unlimited:
-  endpoint-only profiles, an unrestricted local backend, injected clients, and
-  aggregate work across several backends may have no narrower PromptKit limit.
-- Continue defaulting `concurrency.stage_workers.extract` to the effective
-  `total_llm`, making its default 16 as part of the same change. Preserve an
-  explicit lower extract-worker setting when an operator wants less queued or
-  concurrent extraction work.
-- Define effective provider concurrency as the intersection of the Notarius
-  application-wide limit, the selected PromptKit backend limit when present,
-  and the work made available by stage execution. A Notarius limit of 16 does
-  not narrow a backend already limited to 16, while a local backend limited to
-  4 remains bounded at 4.
-- Treat the default as an application-wide safety ceiling across profiles,
-  backends, modules, retries, and validators. A run that intentionally needs
-  the combined capacity of several backends may configure a higher
-  `total_llm` and an appropriate extract-worker count explicitly.
-- Retain the existing configuration and environment override surfaces. Update
-  canonical configuration, operations, and internal documentation together
-  when the default changes.
-- Reconsider decoupling the extract-worker default from `total_llm` only after
-  mixed-backend workloads demonstrate a need for a high global emergency
-  ceiling with a lower default work-production rate.
-
 ## Shared Normalization And Quality Work
 
 ### Generic LLM-Assisted Deduplication